Database Develop

Unlocked Sprint HTC One on AT&T

I see this question asked a few times within other treads but wasn't ever really answered clearly in my situation. I have successfully network unlocked my Sprint HTC One. When I put the sim in I get no errors and dialing 4636 brings me to the menu where I can change to wcmda preferred..gsm only... etc.. The phone reads the phone number off the sim and lists it on this page as well. Heres my issue I have verified that phone will cover the same bands where I am so that should not be an issue. I can not get a signal with this phone with 2 different sims. I made sure I did all the obvious things with the settings, the APN's, flashed different radios, and tried different options is the 4636 menu. Ive used different roms as well...When I go to select or search for my network both options are grayed out.... I can connect to Verizon and I can connect to sprint towers but no Dice on ATT. I am currently on version 4.1.2 and have tried all available radios. Has anyone had success in the new York New Jersrey PA area with using this phone on ATT. If so what is the setup you are using.

KoolAidBigMan said:
I see this question asked a few times within other treads but wasn't ever really answered clearly in my situation. I have successfully network unlocked my Sprint HTC One. When I put the sim in I get no errors and dialing 4636 brings me to the menu where I can change to wcmda preferred..gsm only... etc.. The phone reads the phone number off the sim and lists it on this page as well. Heres my issue I have verified that phone will cover the same bands where I am so that should not be an issue. I can not get a signal with this phone with 2 different sims. I made sure I did all the obvious things with the settings, the APN's, flashed different radios, and tried different options is the 4636 menu. Ive used different roms as well...When I go to select or search for my network both options are grayed out.... I can connect to Verizon and I can connect to sprint towers but no Dice on ATT. I am currently on version 4.1.2 and have tried all available radios. Has anyone had success in the new York New Jersrey PA area with using this phone on ATT. If so what is the setup you are using.
Click to expand...
Click to collapse
The Sprint HTC one has blocked the carrier id's for domestic use aka att. You can however if your s-off you can flash the initial release radio the first radio when the Sprint HTC was released and it will allow you to connect to domestic carriers.
I'm in Ohio so not too far from you and I can pick up T-Mobile and att using the initial release radio, it is the only radio I could get to pick up signal.
Here is the first radio released http://d-h.st/HHD

Im currently s-off and flashed that radios. When I select network connection the two options are still grayed out. Could the rom choice make any difference ?

Same here....help please
Sent from my HTCONE using XDA Premium 4 mobile app

pyrobo0by said:
Same here....help please
Sent from my HTCONE using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I am having the same issue with my Sprint HTC One. I've tried everything mentioned above and no one has answered. Are you guys still having this issue? And if not what did you do to fix it. I have a Sprint HTC One with S-Off, Unlocked Bootloader, the Radio that is listed here and the latest ViperOne 5.7.0 ROM. Thanks!
EDIT: My phone is unlocked and I have been using T-Mobile for the past month just fine, and want to try AT&T.

wireproof said:
I am having the same issue with my Sprint HTC One. I've tried everything mentioned above and no one has answered. Are you guys still having this issue? And if not what did you do to fix it. I have a Sprint HTC One with S-Off, Unlocked Bootloader, the Radio that is listed here and the latest ViperOne 5.7.0 ROM. Thanks!
EDIT: My phone is unlocked and I have been using T-Mobile for the past month just fine, and want to try AT&T.
Click to expand...
Click to collapse
I have figured out a way to make AT&T work with the phone. When you place a Sprint or Verizon sim into the phone, it will immediately unlock the network search options that are normally greyed out. I click automatic select and immediately remove the sim and replace it with my AT&T one. Even though the phone complains that the sim was removed, I can click ok, then quickly push the automatic select again before it greys out. I then wait a minute or so until it fails to find a network. I then quickly click the network search option. The notable thing at this point is the only network that shows up is MARITIME. if I click on that, it registers me to AT&T. I have tested the phone and it works great. But it seems to bump me off the network at some point. I dont know if its poor reception or the ROM itself doing it. And if I restart the phone, I lose it as well. So I have to repeat the steps again to get back on AT&T. But the thing to know here is that the phone will work with domestic carriers with no problem. Its a matter of locking to AT&T and staying there. Surely one of the brilliant brains on these forums can figure out how to keep it working. I basically stumbled onto this by playing around with it.

joem789 said:
I have figured out a way to make AT&T work with the phone. When you place a Sprint or Verizon sim into the phone, it will immediately unlock the network search options that are normally greyed out. I click automatic select and immediately remove the sim and replace it with my AT&T one. Even though the phone complains that the sim was removed, I can click ok, then quickly push the automatic select again before it greys out. I then wait a minute or so until it fails to find a network. I then quickly click the network search option. The notable thing at this point is the only network that shows up is MARITIME. if I click on that, it registers me to AT&T. I have tested the phone and it works great. But it seems to bump me off the network at some point. I dont know if its poor reception or the ROM itself doing it. And if I restart the phone, I lose it as well. So I have to repeat the steps again to get back on AT&T. But the thing to know here is that the phone will work with domestic carriers with no problem. Its a matter of locking to AT&T and staying there. Surely one of the brilliant brains on these forums can figure out how to keep it working. I basically stumbled onto this by playing around with it.
Click to expand...
Click to collapse
Good job finding that. When it kicks you off of AT&T's network it did that to me when I had T-Mobile as well, so it's not just AT&T. Glad you were able to get AT&T to work on your phone tho, kudos.

N900A, T-Mobile ROM, and WiFi Calling/SMS...

Hello,
I just retired my venerable Samsung T699 Relay 4G (RIP QWERTY Keyboard) and, just picked up an unlocked, "refurbished" AT&T Note 3 for pretty cheap (it was sold as an "International" model, so I didn't know it was an AT&T version until I got it). I've had T-Mobile service for the last couple of years, and the big draw, for me, is WiFi calling/SMS; I've installed SafeStrap and been trying some T-Mobile ROMs, but can't seem to get WiFi calling to work. Obviously I've got a T-Mobile SIM card, and I've tried changing/adding APNs, and installing different builds of KitKat (some of which won't even boot - NB4 and NF9 seem to work best), but I still can't get it to work properly. I've been racking my brain and searching the Interspace for the last two weeks with no luck... what am I missing? Is it even possible?
Thanks in advance!

Hello,
As a fellow N900A user on Tmobile, I have been trying to get wifi calling as well.
I tried using a tmobile stock rom with wifi calling baked in (tweaked), but that did not work. I was told that I need to add an emergency 911 address, but even doing this did not do it.
I would think that wifi calling is doable, but something tells me that tmobile might be doing something similar to Verizon. Rumor was that Verizon had a list of IMEIs, and if your IMEI was not on their list, you couldn't bring the phone over to Verizon, even if it were CDMA capable (once again, this is rumor as I cannot confirm this is true).
The closest I have been to getting wifi calling through tmobile was having the settings show on the stock tmobile rom, but that was about it. Maybe someone in the forums has an answer/got it working, but I have yet to see one. I'll keep you posted if I somehow get it to work, but something tells me this won't happen for a while.
AresRising said:
Hello,
I just retired my venerable Samsung T699 Relay 4G (RIP QWERTY Keyboard) and, just picked up an unlocked, "refurbished" AT&T Note 3 for pretty cheap (it was sold as an "International" model, so I didn't know it was an AT&T version until I got it). I've had T-Mobile service for the last couple of years, and the big draw, for me, is WiFi calling/SMS; I've installed SafeStrap and been trying some T-Mobile ROMs, but can't seem to get WiFi calling to work. Obviously I've got a T-Mobile SIM card, and I've tried changing/adding APNs, and installing different builds of KitKat (some of which won't even boot - NB4 and NF9 seem to work best), but I still can't get it to work properly. I've been racking my brain and searching the Interspace for the last two weeks with no luck... what am I missing? Is it even possible?
Thanks in advance!
Click to expand...
Click to collapse

gangpe said:
Hello,
As a fellow N900A user on Tmobile, I have been trying to get wifi calling as well.
I tried using a tmobile stock rom with wifi calling baked in (tweaked), but that did not work. I was told that I need to add an emergency 911 address, but even doing this did not do it.
I would think that wifi calling is doable, but something tells me that tmobile might be doing something similar to Verizon. Rumor was that Verizon had a list of IMEIs, and if your IMEI was not on their list, you couldn't bring the phone over to Verizon, even if it were CDMA capable (once again, this is rumor as I cannot confirm this is true).
The closest I have been to getting wifi calling through tmobile was having the settings show on the stock tmobile rom, but that was about it. Maybe someone in the forums has an answer/got it working, but I have yet to see one. I'll keep you posted if I somehow get it to work, but something tells me this won't happen for a while.
Click to expand...
Click to collapse
Yeah, considering I have zero service with any provider where I live (but 4G LTE 100 yards down the street), WiFi services were the single reason I went with T-Mobile. Considering the Unlocking Bill, one wouldn't think a carrier could block IMEIs from being used on another carrier... but I have a hard time reading the fine print, so there is that.
I've tried several of the stock T-Mobile ROMs, and while WiFi calling was there, it simply wouldn't enable; it would try to enable, but never would. Have you contacted T-Mobile and asked if there are any potential fixes? I'm considering doing that, but am worried that they'll say "Oh, that's your IMEI, looks like you can't use it on our network SORRYABOUTYOURLUCK!"

I have contacted tmobile about this before.
Their response was that they did not know why it did not work. They helped me set up the emergency 911 address, but they said when it comes to other hardware they couldn't give me a reason why it wouldn't work.
I remember dwetherill (sp?) mention that some n900a users were able to get wifi calling on their phones. I don't know if the modem can/will affect wifi calling, but at this point it's the easier thing to test.
I'm on the NJ5 modem - I might try testing out NC2.
Have you tried carl's TMB version of the norma stable rom? Check it out if you haven't. Wifi calling is supposed to connect automatically. I haven't seen it work yet, but I'll keep you posted if somehow I get it to work.
AresRising said:
Yeah, considering I have zero service with any provider where I live (but 4G LTE 100 yards down the street), WiFi services were the single reason I went with T-Mobile. Considering the Unlocking Bill, one wouldn't think a carrier could block IMEIs from being used on another carrier... but I have a hard time reading the fine print, so there is that.
I've tried several of the stock T-Mobile ROMs, and while WiFi calling was there, it simply wouldn't enable; it would try to enable, but never would. Have you contacted T-Mobile and asked if there are any potential fixes? I'm considering doing that, but am worried that they'll say "Oh, that's your IMEI, looks like you can't use it on our network SORRYABOUTYOURLUCK!"
Click to expand...
Click to collapse

gangpe said:
I have contacted tmobile about this before.
Their response was that they did not know why it did not work. They helped me set up the emergency 911 address, but they said when it comes to other hardware they couldn't give me a reason why it wouldn't work.
I remember dwetherill (sp?) mention that some n900a users were able to get wifi calling on their phones. I don't know if the modem can/will affect wifi calling, but at this point it's the easier thing to test.
I'm on the NJ5 modem - I might try testing out NC2.
Have you tried carl's TMB version of the norma stable rom? Check it out if you haven't. Wifi calling is supposed to connect automatically. I haven't seen it work yet, but I'll keep you posted if somehow I get it to work.
Click to expand...
Click to collapse
I'm on NC2, and haven't gotten anything to work as of yet... I've been looking for modem threads, but I guess I need to look a little harder. I'll search that ROM out and give it a shot, and let you know if it works with NC2. Thanks for the heads-up! :good:

So I tried NC2 modem, and it is not allowing for wifi calling.
I went to tmobile yesterday to get another line added. Rumor on the tmobile side is that AT&T is working to get wifi calling setup for the n900a's by around April. Take it as a rumor at this point, seeing how it came from tmobile, but the rep made a good point - AT&T tends to follow what tmobile is doing, so who knows.
Here's to hoping they're right.
BTW, I went to the note 4 tmobile forums, and I grabbed a deodexed stock rom. I noticed that there were a few files related to wifi calling (had WFC in the name). I tried playing around with it last night, and I managed to get the settings. It will even go so far as to turn the phone GSM radio off when you select wifi only. It's doing what Tweaked was doing for me (which was keeping the wifi calling option grayed out (enabling). I think I'm still missing a few files to get it to work, but I'll keep playing around with it later and let you know if I have any success.
AresRising said:
I'm on NC2, and haven't gotten anything to work as of yet... I've been looking for modem threads, but I guess I need to look a little harder. I'll search that ROM out and give it a shot, and let you know if it works with NC2. Thanks for the heads-up! :good:
Click to expand...
Click to collapse

gangpe said:
So I tried NC2 modem, and it is not allowing for wifi calling.
I went to tmobile yesterday to get another line added. Rumor on the tmobile side is that AT&T is working to get wifi calling setup for the n900a's by around April. Take it as a rumor at this point, seeing how it came from tmobile, but the rep made a good point - AT&T tends to follow what tmobile is doing, so who knows.
Here's to hoping they're right.
BTW, I went to the note 4 tmobile forums, and I grabbed a deodexed stock rom. I noticed that there were a few files related to wifi calling (had WFC in the name). I tried playing around with it last night, and I managed to get the settings. It will even go so far as to turn the phone GSM radio off when you select wifi only. It's doing what Tweaked was doing for me (which was keeping the wifi calling option grayed out (enabling). I think I'm still missing a few files to get it to work, but I'll keep playing around with it later and let you know if I have any success.
Click to expand...
Click to collapse
I wonder how that would work regarding using a T-Mobile SIM in the AT&T phone, and if it could support cross-carrier features like that.
You're a braver soul than I, that's for sure. If I knew anything about what I was looking at/for, I'd be more than willing to help get this nut cracked... otherwise, I look forward to your findings!

M7 losing cellular connection frequently! What is going on?

Hi everyone,
This is a great site with a mass of info! I've used it before to flash my HTC Sensation a few years ago.
Since then, I've had a HTC One X and now a HTC One M7. Ok, the M7 is 'New' (from China). It's in excellent condition and it actually does appear to be new. So I don't really know what's going on there... But anyway, I'm having issues.
The phone can't seem to keep a cellular signal, but Wifi is absolutely fine.
So a bit about the history of the phone; When I got it, it was on Android 4.4.2 IIRC with super CID already done. I unlocked the bootloader and flashed LineageOS onto it - the latest one. The battery life was appalling and it wouldn't charge. The phone signal kept dropping.
I've reflashed it today with an RUU called "RUU_M7_UL_L50_SENSE60_MR_BrightstarUS_WWE_7.17.1540.51.exe" and battery life appears to have improved somewhat.
However, the cellular signal keep dropping. Now, I've contacted Virgin UK and explained the situation and they have said the Sim is faulty and it's old apparently and not 4g. They've since sent me a new 4g sim. I've put it in and activated it yesterday.
I still don't understand why my signal keep disappearing.
I've checked and verified the APN details - They seem correct - "Virgin Media Mobile Internet".
The problem appears to be something to do with "Network Mode" or "Network Operator". Sometimes I've noticed that if I go back into the settings and change the selection, sometimes it seems to see the connection again!
Right now, I've selected "2G/3G/4G auto" network mode with "Virgin 2G/3G" as the operator, but I think that soon, it will drop again!
Does any of this sound familiar to anyone here? Thanks, Antony...

Ok, I've just lost signal now, around 2hrs later... My phone has just been left in my house... I've been checking on it every so often.
If I go to "Network Operators" and choose Virgin, it magically works again!
I have full signal again, calls work and internet works. What the?!?!

It's still doing it.
Apparently, it's because I've got a 3G plan but using a 4G sim. Although, that is strange because even if I choose 2G/3G, it still drops.
Mehhhhh.

[email protected] said:
It's still doing it.
Apparently, it's because I've got a 3G plan but using a 4G sim. Although, that is strange because even if I choose 2G/3G, it still drops.
Mehhhhh.
Click to expand...
Click to collapse
Can you post a "fastboot gervar all" output please? You have superCID, which means your phone is, or was s-off at one point in time. Maybe you need to flash a different RUU to get everything working

donkeykong1 said:
Can you post a "fastboot gervar all" output please? You have superCID, which means your phone is, or was s-off at one point in time. Maybe you need to flash a different RUU to get everything working
Click to expand...
Click to collapse
Hey, thanks for your reply!
Since that last post, I've flashed a UK ROM and it was still the same, in a way worse because it dumbed down some options in network settings. I've since flashed it back to the ROM mentioned above. I've now noticed that the problem is something to do with 3G/4G. If I change the network provider to 2G ONLY, the phone works perfectly with my Virgin SIM.
I desperately want to fix this. My new provider which I've switched to doesn't offer 2G, so I'll effectively be screwed.
Here is the data which you asked me to get!

[email protected] said:
Hey, thanks for your reply!
Since that last post, I've flashed a UK ROM and it was still the same, in a way worse because it dumbed down some options in network settings. I've since flashed it back to the ROM mentioned above. I've now noticed that the problem is something to do with 3G/4G. If I change the network provider to 2G ONLY, the phone works perfectly with my Virgin SIM.
I desperately want to fix this. My new provider which I've switched to doesn't offer 2G, so I'll effectively be screwed.
Here is the data which you asked me to get!
Click to expand...
Click to collapse
You flashed US unlocked RUU, but that should work fine. You need x.xx.401.xx for WWE, but, as I said, US unlocked should work fine. I had a similar issue with an AOSP ROM, and I resolved it by manually entering my APN settings. Even though all APN settings looked fine, there were some small differences that caused issues. Not a great help, but you could try it, no harm. If thadoesn't work, it's most likely a hardware issue

donkeykong1 said:
You flashed US unlocked RUU, but that should work fine. You need x.xx.401.xx for WWE, but, as I said, US unlocked should work fine. I had a similar issue with an AOSP ROM, and I resolved it by manually entering my APN settings. Even though all APN settings looked fine, there were some small differences that caused issues. Not a great help, but you could try it, no harm. If thadoesn't work, it's most likely a hardware issue
Click to expand...
Click to collapse
Hmmm, ok, thanks. I've already messed about with APN details lots of times.
Ahh well. It seems that this phone is doomed. Maybe I'll just have to buy another.
I'll just give it one more go.
Thanks, Antony

Can I install stock AT&T ROM on an unlocked S10 from Samsung

I just got my new unlocked S10 all set up dialed in. Model SMG973U1ZBAX.
I put in my AT&T SIM card in and went to turn on Wifi calling and couldn't find it. I've since learned that if you have an unlocked phone, you can USE the AT&T network, but you can't get Wifi calling (which is a must for me), Visual Voicemail or HD Voice.
Instead of flat out returning it, can I just flash the AT&T ROM and it would be as if it was a a stock AT&T phone?
I know I would get all the bloatware and stuff like that, But I have to have wifi calling.
Are there links yet to Stock AT&T ROM for the S10? I couldn't find any on the site.
Thanks

djrecon said:
I just got my new unlocked S10 all set up dialed in. Model SMG973U1ZBAX.
I put in my AT&T SIM card in and went to turn on Wifi calling and couldn't find it. I've since learned that if you have an unlocked phone, you can USE the AT&T network, but you can't get Wifi calling (which is a must for me), Visual Voicemail or HD Voice.
Instead of flat out returning it, can I just flash the AT&T ROM and it would be as if it was a a stock AT&T phone?
I know I would get all the bloatware and stuff like that, But I have to have wifi calling.
Are there links yet to Stock AT&T ROM for the S10? I couldn't find any on the site.
Thanks
Click to expand...
Click to collapse
Yes you can there's a thread somewhere in here with specifics on how to do it. I know you have to flash thru patched Odin and make sure you also flash userdata and csc to corresponding carrier.

jaestreetss said:
Yes you can there's a thread somewhere in here with specifics on how to do it. I know you have to flash thru patched Odin and make sure you also flash userdata and csc to corresponding carrier.
Click to expand...
Click to collapse
That's great news! Thanks. And I wouldn't have to root, right?
Does anyone know where the stock AT&T S10 ROM is? My searches are coming up empty. Or is "AT&T ROM" the wrong search words?

djrecon said:
That's great news! Thanks. And I wouldn't have to root, right?
Does anyone know where the stock AT&T S10 ROM is? My searches are coming up empty. Or is "AT&T ROM" the wrong search words?
Click to expand...
Click to collapse
Root is unrelated to firmware flashing. You only need Odin and the fw package. Your computer may, or may not need the Samsung USB drivers to be recognized.
Samfirm can be used to pull updates. You might find it on sammobile or updato, haven't checked.

djrecon said:
That's great news! Thanks. And I wouldn't have to root, right?
Does anyone know where the stock AT&T S10 ROM is? My searches are coming up empty. Or is "AT&T ROM" the wrong search words?
Click to expand...
Click to collapse
You should look for the G973U firmware. Thread is located HERE

jaestreetss said:
Yes you can there's a thread somewhere in here with specifics on how to do it. I know you have to flash thru patched Odin and make sure you also flash userdata and csc to corresponding carrier.
Click to expand...
Click to collapse
Sigh. Well. I can report and confirm that you can not use Wifi calling on the AT&T network with an unlocked S10.
Even though I loaded stock AT&T firmware, and was up to date, it just won't work. Gotta return the phone.
I've been dealing with their advanced tech team for over a week and they said that because the IMEI number shows it's an unlocked phone, the system keeps denying Wifi calling.
We actually got it to work at one point. It was a 3 day process with one of their techs forcing my IMEI number through their system. It worked for about an hour, then their system caught it and kicked out it's provisioning.

djrecon said:
Sigh. Well. I can report and confirm that you can not use Wifi calling on the AT&T network with an unlocked S10.
Even though I loaded stock AT&T firmware, and was up to date, it just won't work. Gotta return the phone.
I've been dealing with their advanced tech team for over a week and they said that because the IMEI number shows it's an unlocked phone, the system keeps denying Wifi calling.
We actually got it to work at one point. It was a 3 day process with one of their techs forcing my IMEI number through their system. It worked for about an hour, then their system caught it and kicked out it's provisioning.
Click to expand...
Click to collapse
I have it on my phone
The wifi calling but I had to get a whole new sim at the store I have provided a screen shot.

jaestreetss said:
I have it on my phone
The wifi calling but I had to get a whole new sim at the store I have provided a screen shot.
Click to expand...
Click to collapse
Oh wow. That's great! I tried the new SIM, same results unfortunately.
Maybe it's just the network out here in LA.

Galaxy S10 unlocked ATT firmware question
Hi I recently got Galaxy S10 Unlocked phone on online. At first i didnt get ATT wifi calling options appeared in my phone. Later i followed same thread that has 973U ATT firmware links, and flashed using ODIN. I can see all ATT apps and ATT wifi calling option now but i cannot enable it. When i enable it i got a message saying we cannot turn on WIFI calling on this a device and error code EDS0008. I tried to call ATT folks, but they are saying WIFI calling and HD voice is not supported on this unlocked device. Somehow they are seeing 973U1 as model number, but i had 973U as model number. I tried chaining sim to old iphone and I saw WIFI calling is working with IPHONE, but its just this phone I am seeing error. I am not sure what to do now. Did you see this issue ?
Can you give me exactly about the files you used and post steps to get att wifi calling ?
sorry for posting questions in multiple threads

I have an unlocked S10e and I use T-Mobile and before even flashing T-Mo firmware, I did have WiFi calling out of the box. Change carrier

avireddy1 said:
Hi I recently got Galaxy S10 Unlocked phone on online. At first i didnt get ATT wifi calling options appeared in my phone. Later i followed same thread that has 973U ATT firmware links, and flashed using ODIN. I can see all ATT apps and ATT wifi calling option now but i cannot enable it. When i enable it i got a message saying we cannot turn on WIFI calling on this a device and error code EDS0008. I tried to call ATT folks, but they are saying WIFI calling and HD voice is not supported on this unlocked device. Somehow they are seeing 973U1 as model number, but i had 973U as model number. I tried chaining sim to old iphone and I saw WIFI calling is working with IPHONE, but its just this phone I am seeing error. I am not sure what to do now. Did you see this issue ?
Can you give me exactly about the files you used and post steps to get att wifi calling ?
sorry for posting questions in multiple threads
Click to expand...
Click to collapse
Your best bet is to do an exchange for an AT&T version.
You can Flash the AT&T firmware. But there will be no way in h*** for you to actually enable the Wi-Fi calling feature since they block those IMEI numbers on their servers. YOU HAVE BEEN WARNED. YOU MIGHT NOT BE ABLE TO REVERT IT BACK TO THE OTHER FIRMWARE.

monkeydroiid said:
your best bet is to do an exchange for an at&t version.
You can flash the at&t firmware. But there will be no way in h*** for you to actually enable the wi-fi calling feature since they block those imei numbers on their servers. You have been warned. You might not be able to revert it back to the other firmware.
Click to expand...
Click to collapse
Quick question for ya:
YOU HAVE BEEN REPLIED TO. WHY CAN'T THEY JUST REFLASH THE PHONE WITH STOCK U1 FIRMWARE?

monkeyDroiid said:
Your best bet is to do an exchange for an AT&T version.
You can Flash the AT&T firmware. But there will be no way in h*** for you to actually enable the Wi-Fi calling feature since they block those IMEI numbers on their servers. YOU HAVE BEEN WARNED. YOU MIGHT NOT BE ABLE TO REVERT IT BACK TO THE OTHER FIRMWARE.
Click to expand...
Click to collapse
This is absolutely not true. I just switched my unlocked S10 (u1) to the ATTfirmware and Wifi calling is working great with no issues turning it on at all.

badbread said:
This is absolutely not true. I just switched my unlocked S10 (u1) to the ATTfirmware and Wifi calling is working great with no issues turning it on at all.
Click to expand...
Click to collapse
That's great to know badbread. Did you use the link https://forum.xda-developers.com/galaxy-s10/how-to/s10e-g973u-g973u1-firmware-links-t3905852 for the firmware files.
I haven't attempted this before so I thought I'd ask before screwing anything up.
Thanks.

mamartin9 said:
That's great to know badbread. Did you use the link https://forum.xda-developers.com/galaxy-s10/how-to/s10e-g973u-g973u1-firmware-links-t3905852 for the firmware files.
I haven't attempted this before so I thought I'd ask before screwing anything up.
Thanks.
Click to expand...
Click to collapse
Yes, that post and a couple others. Pretty painless process TBH.
I can confirm Wifi calling works, HD voice and a WAY WAY WAY better signal. Prior to flashing to ATT I could barely use my phone on my subway ride home... Now it works very well the entire trip.

badbread said:
Yes, that post and a couple others. Pretty painless process TBH.
I can confirm Wifi calling works, HD voice and a WAY WAY WAY better signal. Prior to flashing to ATT I could barely use my phone on my subway ride home... Now it works very well the entire trip.
Click to expand...
Click to collapse
I successfully flashed and am now seeing the ATT bloatware but WIFI calling and visual voicemail, etc are saying "OOPS! We can't turn onWi-Fi calling for your account. I'm going to attempt to flash with the clean boot version and see if that changes anything. Did you do anything different or additional to get it up and running. Not sure if it matters but I'm in Southern CA.
Has anyone else been successful in adding wifi calling, hd voice, etc?
I'm using build G973U SF6 with USERDATA_ATT_G973USQU2ASF6.
I'm on a US Unlocked Galaxy 10.

mamartin9 said:
I successfully flashed and am now seeing the ATT bloatware but WIFI calling and visual voicemail, etc are saying "OOPS! We can't turn onWi-Fi calling for your account. I'm going to attempt to flash with the clean boot version and see if that changes anything. Did you do anything different or additional to get it up and running. Not sure if it matters but I'm in Southern CA.
Has anyone else been successful in adding wifi calling, hd voice, etc?
I'm using build G973U SF6 with USERDATA_ATT_G973USQU2ASF6.
I'm on a US Unlocked Galaxy 10.
Click to expand...
Click to collapse
I'm away from the computer I did it on but I used the SAT1 firmware file and then manually updated all the way back up to the June update.
The updating part is/was a major PITA as it wiped the device each time. I'm hoping i'll get OTA's when they are released. Time will tell.
I'm in the Bay Area on ATT and it activated right away on the base february firmware I installed initially. Also I don't think I did any userdata stuff as I don't remember choosing it... I'll update this post tonight when I can check all the files I d/loaded on my machine at home.
Couple other things:
I can't find it right now but I followed a post that stated to make sure the SIM and SD card were removed during the flashing process. Not sure if that makes a difference.

badbread said:
Yes, that post and a couple others. Pretty painless process TBH.
I can confirm Wifi calling works, HD voice and a WAY WAY WAY better signal. Prior to flashing to ATT I could barely use my phone on my subway ride home... Now it works very well the entire trip.
Click to expand...
Click to collapse
did you ever run the unlocked firmware on ATT or did you flash to att before ever using an active sim? i had heard some speculation that once you run an unlocked phone, then it gets registered as "non att"... keep in mind this is 3rd hand info and hearsay.
edit. i guess i failed to read you short post... i see "prior to flashing" spelled out for me right there....

badbread said:
I'm away from the computer I did it on but I used the SAT1 firmware file and then manually updated all the way back up to the June update.
The updating part is/was a major PITA as it wiped the device each time. I'm hoping i'll get OTA's when they are released. Time will tell.
I'm in the Bay Area on ATT and it activated right away on the base february firmware I installed initially. Also I don't think I did any userdata stuff as I don't remember choosing it... I'll update this post tonight when I can check all the files I d/loaded on my machine at home.
Couple other things:
I can't find it right now but I followed a post that stated to make sure the SIM and SD card were removed during the flashing process. Not sure if that makes a difference.
Click to expand...
Click to collapse
Any chance you found those other posts you mentioned above? I continue to be unable to get wifi calling on my phone.
By the way for anyone else, while I did not get wifi calling, visual voicemail, etc. I do see an improvement on my cell reception over the ATT network.

Ops sorry, thought I replied.
Here it is:
https://forum.xda-developers.com/showpost.php?p=79156802&postcount=5
I followed those steps exactly.

Samsung Galaxy S10 - Unlocked Phone (AT&T Blocked Call Issue)

So many people are reporting with the 3/1 sweep by AT&T, that they are blocking almost all Unlocked phones: See: Downdector Link We personally have a S10 (G973U1). AT&T is saying on this list: AT&T approved phone list that it is supposed to work. But like many other people "calls" end immediately, but we can text and data work. It is some sorta ploy by AT&T to force us to upgrade our phones. They want us all to upgrade to S22s. Anyway I was ranting. Anyway, if you look at that link, they are saying that the phone has to be on the latest software. The last update from AT&T or the manufacturer was in January. I checked the firmware site, and Android 11 is the latest in January. I'm wondering if there is some hack to get us on to '12' or something. An update might solve this issue. We know that a new SIM does not work. Calls seem to be rejected on the network, just based on the phone model or Android version.
We are aware that a version 12 is out there for the phone, just that firmware is not for our US-unlocked model yet. But maybe it can be hacked?
Edit: It appears this thread may be linked with this older one... But it is ever more pressing issue now:
S10 Unlocked phone with AT&T Firmware here they explain how, and the problems with flashing. This was back in 2019, so I'm not sure if this will still work. Even then it didn't work for everyone. Some in that forum claimed that it did. AT&T seems to now be blocking from their calling network any phones not enabled with VOLTE and the extended AT&T services that are not present in Unlocked phones.

robertkjr3d said:
So many people are reporting with the 3/1 sweep by AT&T, that they are blocking almost all Unlocked phones: See: Downdector Link We personally have a S10 (G973U1). AT&T is saying on this list: AT&T approved phone list that it is supposed to work. But like many other people "calls" end immediately, but we can text and data work. It is some sorta ploy by AT&T to force us to upgrade our phones. They want us all to upgrade to S22s. Anyway I was ranting. Anyway, if you look at that link, they are saying that the phone has to be on the latest software. The last update from AT&T or the manufacturer was in January. I checked the firmware site, and Android 11 is the latest in January. I'm wondering if there is some hack to get us on to '12' or something. An update might solve this issue. We know that a new SIM does not work. Calls seem to be rejected on the network, just based on the phone model or Android version.
We are aware that a version 12 is out there for the phone, just that firmware is not for our US-unlocked model yet. But maybe it can be hacked?
Edit: It appears this thread may be linked with this older one... But it is ever more pressing issue now:
S10 Unlocked phone with AT&T Firmware here they explain how, and the problems with flashing. This was back in 2019, so I'm not sure if this will still work. Even then it didn't work for everyone. Some in that forum claimed that it did. AT&T seems to now be blocking from their calling network any phones not enabled with VOLTE and the extended AT&T services that are not present in Unlocked phones.
Click to expand...
Click to collapse
I was helped by a user to achieve ascendance onto the AT&T network. I'm not sure if I'm to reveal his name. We 1) go into Developers mode on the phone. 2) Hack the Kernel. 3) Flash the rom to the G973U (model)... with the AT&T firmware. So that the Wifi-Calling and 5G features would work, and AT&T would allow it on their network.

robertkjr3d said:
I was helped by a user to achieve ascendance onto the AT&T network. I'm not sure if I'm to reveal his name. We 1) go into Developers mode on the phone. 2) Hack the Kernel. 3) Flash the rom to the G973U (model)... with the AT&T firmware. So that the Wifi-Calling and 5G features would work, and AT&T would allow it on their network.
Click to expand...
Click to collapse
I've literally been searching for an answer to this for days now. My wife and I have S10's. I work far from home so I really need her phone working in case of emergency. Can you please point me in the general direction? Thanks!

Agreed, I didn't know such a thing was possible, but I'd love to hear more about this!

skrapmetal said:
I've literally been searching for an answer to this for days now. My wife and I have S10's. I work far from home so I really need her phone working in case of emergency. Can you please point me in the general direction? Thanks!
Click to expand...
Click to collapse
At first I had to use the Samsung Band Selector app from the Play store and go into More Network Settings > AT&T > Preferred Network Type and choose 3G. Unfortunately this killed LTE so all data and calls were going through H+. As I was mostly on wifi I could live with it since I could actually use the phone again.
Then Friday morning I checked for updates and there was the update to take me to Android 12. I took the update then when it finished it said it needed to reboot to connect new SIM to carrier services....it wasn't a new SIM. I let it reboot and everything was working with VoLTE again.
Hope this helps.

KennyG123 said:
At first I had to use the Samsung Band Selector app from the Play store and go into More Network Settings > AT&T > Preferred Network Type and choose 3G. Unfortunately this killed LTE so all data and calls were going through H+. As I was mostly on wifi I could live with it since I could actually use the phone again.
Then Friday morning I checked for updates and there was the update to take me to Android 12. I took the update then when it finished it said it needed to reboot to connect new SIM to carrier services....it wasn't a new SIM. I let it reboot and everything was working with VoLTE again.
Hope this helps.
Click to expand...
Click to collapse
I appreciate you getting back to me. Unfortunately I am still on android 11 with a custom ROM and also this is a global phone so that app didnt work for me. I dont receive OTA updatez. I'll update to a new ROM and see what happens. Thanks