I've had U1 firmware on my device since July. I've been having an issue where one, single, number had an issue calling me. It would go to voicemail immediately. T-Mobile approved a warranty exchange and while waiting, I went back to the latest U firmware. Now, I can receive every call.
What gives? Has anyone else had an issue with U1 firmware? If so, who is your carrier?
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I got a new in box S10 5G that seems unlocked but can't seem to make voice calls with Rakuten Mobile in Japan. I'd seen other Japanese users have such issue with other Android devices and could resolve it by activating VoLTE but no such options seems to exist on the S10 5G as I have it. The current firmware on it is April 2019 but it won't seem to upgrade to the latest automatically. Suspect it is because the box says LG U+ which is a Korean carrier and the updates normally come from there. Is this some sort of region lock issue that I need get a U+ SIM in making the calls for the first 5 mins? Have never rooted a phone before so apologies and bash if necessary, but if I use something like Odin, will that unlock VoLTE options if I update to the latest version and will is disable other features and delete the factory installed apps? Many thanks for any advice and guidance.
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.
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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.
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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!
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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.
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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
As the titled says, I have an unlocked Note 9 that was initially on sprint/Tmobile a few years ago and it is unlocked. I just switched to AT&T and i am able to use data and text, but i cannot make calls or access my voicemail. Says call ended as soon as i try and make a call or hold #1. No VoLTE or wifi calling options either. Do i need to flash the unlocked firmware to gain all features?
Please help!
Is it a N960U or N960U1? They are supported.
See attachment.
Similar here. ATT shut down 3G in my area. My carrier unlocked Note 9 is running Oreo 8.1. ATT is telling me i have to update to latest available software released for my device in order to access VoLTE. My wife who has an ATT firmware flashed note 9 never had an issue from day 1. There is something in the unlocked firmware (or att blacklisting unlocked phones) that is not allowing VoLTE. In the hidden menu 4636, my VoLTE is greyed out and OFF. I am trying to decide if i update to PIE and see if it is indeed unlocked. I just liked OREO appearance over PIE changes...
Pie is more secure and is patched against the worst rootkit that requires a reflash to purge.
You need to update your sim card more than likely. Try that first or try the wife's sim card in it.
I was sent a new Sim and it didnt work. i tried another sim running VoLTE and it didnt work. I resigned to updating and Im up to OneUI2 and it still isnt working. Ill go until ive ran out of updates, then call ATT back... they have "assured me" that my sim and account are fully provisioned. I remain skeptical.
Went through all updates, about 4hours worth and 7 iterations. Issue was not resolved until android 10, OneUI 1.0. VoLTE provisioning switch still greyed out but in "on" status. Still no VoWIFI, another restriction I have no desire to pursue.
Hello, I'm having an issue getting my Visible service working on my Galaxy S21 Ultra SM-G998U1.
I purchased the phone on Swappa to replace my OP7 Pro, so I'm not sure exactly what carrier or model its from. But it should be factory unlocked and I can't call, text, or get data.
I tried installing a Verizon sim but still no service. T-Mobile sim works perfectly though. And I've tried all the troubleshooting steps like network reset, adding APNs, even factory reset.
When I boot the phone or cycle airplane mode, occasionally 5G will turn on for a few seconds and immediately disconnect again.
The APNs all install automatically when I put the SIM in but i just don't get any service, even though it's showing full bars.
go to your sim settings and deactivate it then reactivate it. What version of android are you running? is it rooted? Need more info on your phone. You're sure it's U1 and not an exynos model?
ffuser1 said:
go to your sim settings and deactivate it then reactivate it. What version of android are you running? is it rooted? Need more info on your phone. You're sure it's U1 and not an exynos model?
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I have done that many times. I've also tried all different firmwares and SIMs from various carriers. Visible and Verizon are the only ones that don't work.
It's running Android 12 latest firmware. I believe it was originally purchased from Verizon but it's now on U1.
What does it say under service provider software version under software information? Vzw/vzw, vzw/vzw?
ffuser1 said:
What does it say under service provider software version under software information? Vzw/vzw, vzw/vzw?
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Yes, four VZW codes.
It's strange because when I reboot the phone it will briefly connect to 5G then immediately disconnect and say "Emergency Calls Only". My SIM is activated and works perfectly in my OP7 Pro.
I can also use T-Mobile and ATT Sims in the Samsung.
Ok, so if I lock it to 5G or LTE then the data works. But calls and texts don't work no matter what.
So I figured it out. It seems to have been a hardware issue with the phone itself. I ordered a different S21 Ultra just to see if it would work and it accepted my SIM immediately. For whatever reason it wouldn't accept Visible or Verizon SIMs even though it was unlocked.
Bit frustrating I wasted several days trying to figure out the problem but at least I figured it out. Posting this here in case anyone has a similar issue with a second hand used S21 Ultra.
I had a s8 plus that wouldn't connect to visible and I went through all kinds of heck. I finally figured out that because the firmware was u1 that it was not compatible. When I flashed to a u firmware I was able to connect to visible. I also heard the nines and tens had the same issue. It may be that Verizon puts a block on u1 firmwares
Also I think I had to manually change a few settings for my APN after I change to a firmware ending in u.
Limon_Lime said:
So I figured it out. It seems to have been a hardware issue with the phone itself. I ordered a different S21 Ultra just to see if it would work and it accepted my SIM immediately. For whatever reason it wouldn't accept Visible or Verizon SIMs even though it was unlocked.
Bit frustrating I wasted several days trying to figure out the problem but at least I figured it out. Posting this here in case anyone has a similar issue with a second hand used S21 Ultra.
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It's funny how Visible will not accept The s21 Ultra when I have net10 5G on Verizon towers. Been that way since I bought the phone new last year.
Greetings to the community here!
I came here out of desperation because after several attempts I can't fix the problem with my phone.
I have a Samsung Galaxy S21 Ultra, specifically the model SM-G998U (CSC: ATT/XAA,ATT/ATT). The phone is unlocked and accepts all SIM cards. I live in the Czech Republic (the state in the center of Europe) and I found out that my signal is dropping here. A cell phone imported from the US has different radio waves. See the comparison there:
https://www.kimovil.com/en/frequency-checker/CZ/samsung-galaxy-s21-ultra
I wanted to ask if it is possible to solve this error by flashing SM-998U into SM-998U1 + before flashing, changing the CSC to XAA (or is it after flashing?). The phone has Android 12 and the last update was on April 1, 2022. However, I can't update anything because thanks to AT&T I have to be in the US + have their SIM to be able to get the OTA. Could mobile signal be a software issue (like if I manage to update it, is it going to accept European bands – certainly O2 carrier?)? It keeps losing signal (it switches between no signal - LTE - 5G). During the call, the other party can't hear me because my voice somehow falls out.
By the way, the seller told me that the phone will work in Europe, but it doesn't work for me to make calls. Do I have the right to return the goods?
Is there any kind soul who can help me with this? I will be grateful for any help.
UnknownColour said:
Greetings to the community here!
I came here out of desperation because after several attempts I can't fix the problem with my phone.
I have a Samsung Galaxy S21 Ultra, specifically the model SM-G998U (CSC: ATT/XAA,ATT/ATT). The phone is unlocked and accepts all SIM cards. I live in the Czech Republic (the state in the center of Europe) and I found out that my signal is dropping here. A cell phone imported from the US has different radio waves. See the comparison there:
https://www.kimovil.com/en/frequency-checker/CZ/samsung-galaxy-s21-ultra
I wanted to ask if it is possible to solve this error by flashing SM-998U into SM-998U1 + before flashing, changing the CSC to XAA (or is it after flashing?). The phone has Android 12 and the last update was on April 1, 2022. However, I can't update anything because thanks to AT&T I have to be in the US + have their SIM to be able to get the OTA. Could mobile signal be a software issue (like if I manage to update it, is it going to accept European bands – certainly O2 carrier?)? It keeps losing signal (it switches between no signal - LTE - 5G). During the call, the other party can't hear me because my voice somehow falls out.
By the way, the seller told me that the phone will work in Europe, but it doesn't work for me to make calls. Do I have the right to return the goods?
Is there any kind soul who can help me with this? I will be grateful for any help.
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Click to collapse
Yes you are right . Facing the same problem here in Pakistan I have G998U model and it drop the signal from 4g to 3g (H+) frequently . I use the phone Hotspot in my car to listen to music . But on the same route it drops the signals and keep buffering. In Pakistan Samsung officially released G998B model but I don't like the exynos chip
jahanzaiblohani said:
Yes you are right . Facing the same problem here in Pakistan I have G998U model and it drop the signal from 4g to 3g (H+) frequently . I use the phone Hotspot in my car to listen to music . But on the same route it drops the signals and keep buffering. In Pakistan Samsung officially released G998B model but I don't like the exynos chip
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Click to collapse
Thanks for responding.
I noticed you flashed from SM-G998U to SM-G998U1. Did you notice any change in the signal when you flashed the system? Like, is it better after flashing?
I'm thinking of flashing from the G998U to the G998U1 as well.
Now I have CSC ATT. When I flash it to G998U1 do I have to change the CSC to XAA (via SamFW tool) or just flash it via patched ODIN?
Also, I don't want to lose data when flashing, so I have to put HOME_CSC in the patched ODIN right? I just don't know if putting HOME_CSC will leave the AT&T logo and bloatware on my phone. I don't want to be left with AT&T bloatware, so I'll probably backup my data and put a normal CSC in there that will wipe my data.
@iBowToAndroid
Would you mind helping me out, please? Someone on this page wrote that I should be careful about the bootloader version when flashing. Can I flash from Android 12 (April 2022) to Android 13?
UnknownColour said:
@iBowToAndroid
Can I flash from Android 12 (April 2022) to Android 13?
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Click to collapse
Of course