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Unlocked HTC One Having AT&T LTE Issues

Hey everyone I just bought an unlocked HTC One and switched the SIM card from my iPhone 5 into the new phone. I unlocked the bootloader, rooted it, and installed ARHD Sense version and I am having problems with the phone getting LTE. No matter where I am, I am unable to acquire LTE on the phone. Even in places where I know for sure that it has LTE (due to getting it previously on my iPhone) I'm stuck on HSPA+. Anyone have any ideas what the problem might be? Faulty device maybe? Would rather not have to send the phone back. I have tried also changing the APN, which changed nothing.

brandenk0 said:
Hey everyone I just bought an unlocked HTC One and switched the SIM card from my iPhone 5 into the new phone. I unlocked the bootloader, rooted it, and installed ARHD Sense version and I am having problems with the phone getting LTE. No matter where I am, I am unable to acquire LTE on the phone. Even in places where I know for sure that it has LTE (due to getting it previously on my iPhone) I'm stuck on HSPA+. Anyone have any ideas what the problem might be? Faulty device maybe? Would rather not have to send the phone back. I have tried also changing the APN, which changed nothing.
Click to expand...
Click to collapse
Do you have LTE turned on? You should be on LTE/GSM/WDCMA under Network Mode in settings. Wording may very depending on your ROM.

Yeah I have Lte enabled, which is why I'm confused as to why lte is not working.
Sent from my HTC One using Tapatalk 4

My best guess... Consider calling AT&T and switching off the iPhone data plan to a "smartphone" data plan. I don't know the differences between the 2 but it could be effecting your ability to connect to lte from the one.

viperlox said:
My best guess... Consider calling AT&T and switching off the iPhone data plan to a "smartphone" data plan. I don't know the differences between the 2 but it could be effecting your ability to connect to lte from the one.
Click to expand...
Click to collapse
Hmm I've been considering it just I have seen other people just pop their iPhone 5 SIM into an unlocked/developer edition HTC One and have full LTE connectivity, and not to mention the fact that dealing with AT&T is a pain.

brandenk0 said:
Hmm I've been considering it just I have seen other people just pop their iPhone 5 SIM into an unlocked/dev edition the fact that dealing with AT&T is a pain.
Click to expand...
Click to collapse
I know what ya mean... You could also try flashing at&ts latest radio... It probably only really effects AT&T based roms but it's supposed to open up some new lte bands. I used the link from post 95. http://forum.xda-developers.com/showthread.php?t=2325564&page=10 just make sure you grab the right one installing the one for cm 10 on a sense Rom will mess up your signal strength because it replaces some ril files while flashing the radio. It's a shot in the dark but wont hurt to try.

viperlox said:
My best guess... Consider calling AT&T and switching off the iPhone data plan to a "smartphone" data plan. I don't know the differences between the 2 but it could be effecting your ability to connect to lte from the one.
Click to expand...
Click to collapse
That actually used to be a really common problem, but they seem to use the same data plans for all smartphones now. Still, might be worth a try.

brandenk0 said:
Hey everyone I just bought an unlocked HTC One and switched the SIM card from my iPhone 5 into the new phone. I unlocked the bootloader, rooted it, and installed ARHD Sense version and I am having problems with the phone getting LTE. No matter where I am, I am unable to acquire LTE on the phone. Even in places where I know for sure that it has LTE (due to getting it previously on my iPhone) I'm stuck on HSPA+. Anyone have any ideas what the problem might be? Faulty device maybe? Would rather not have to send the phone back. I have tried also changing the APN, which changed nothing.
Click to expand...
Click to collapse
dial *#*#4636#*#*
click phone info
scroll down
click above "Radio Button"
choose "LTE Only"
reboot device
if didnt work choose "LTE CDMA"
if didnt work
flash another Radio (newer or older)
if didnt work take to to AT&T

Muhammad.Muayad said:
dial *#*#4636#*#*
click phone info
scroll down
click above "Radio Button"
choose "LTE Only"
reboot device
if didnt work choose "LTE CDMA"
if didnt work
flash another Radio (newer or older)
if didnt work take to to AT&T
Click to expand...
Click to collapse
Thanks will try that out soon. Also, to the person above, tried flashing an AT&T radio, which didn't help anything, but was worth the shot. Thanks for the help guys.
EDIT: So tried out switching it to LTE Only and it wouldn't let the setting stick. It would automatically change the preferred network type back to what it was whenever selecting LTE Only. Also, the LTE, CDMA option did not change anything. Again thanks for the help, I'm just going to send it back and hope for the best with a new device.

Verizon Moto X on T-mobile

Hi,
Currently with Big Red but will switch to "someone" once contract is up 3rd qtr next year. Most probably because of the the price and I am sick of VZ dropping back to 3G most of the time where I am.
If I get a Verizon Moto X can I later use that on TMobile. And/rather, a Verizon Moto X can be used on which carriers - all or none
much appreciated.

If it's a developer edition then "I believe" you could use it on sprint. T-Mobile is a GSM carrier and since the only option on the CDMA phones is for global GSM for international travel that you will likely not get it to work. They don't have the radios in it to work on T-mobile. Someone correct me if I'm wrong.

themogul said:
Hi,
Currently with Big Red but will switch to "someone" once contract is up 3rd qtr next year. Most probably because of the the price and I am sick of VZ dropping back to 3G most of the time where I am.
If I get a Verizon Moto X can I later use that on TMobile. And/rather, a Verizon Moto X can be used on which carriers - all or none
much appreciated.
Click to expand...
Click to collapse
This has been covered before yes it will. Verizon moto x is ( might be wrong) the only phone that is Sim unlocked besides T-Mobile and gsm developer edition. Tmobile Sim should work just fine.
http://forum.xda-developers.com/showthread.php?t=2442735
Sent from my XT1060 using xda app-developers app

mawells787 said:
This has been covered before yes it will. Verizon moto x is ( might be wrong) the only phone that is Sim unlocked besides T-Mobile and gsm developer edition. Tmobile Sim should work just fine.
http://forum.xda-developers.com/showthread.php?t=2442735
Sent from my XT1060 using xda app-developers app
Click to expand...
Click to collapse
I put a prepaid T-Mobile sim into my Dev Verizon Moto X, and I get good LTE speeds.

folsom68 said:
I put a prepaid T-Mobile sim into my Dev Verizon Moto X, and I get good LTE speeds.
Click to expand...
Click to collapse
Just seconding that I put a T-Mobile SIM in to my VZW dev edition Moto X (4.4), and it was SIM unlocked as expected, but also had good LTE signal, indicating that Band 4 is definitely enabled on these phones, contrary to published specs. Good news!

Can you make phone calls and send text messages with a T-Mo SIM in a VZW phone? Seems as if a CDMA phone would not work on a GSM network for calls and texts.
Sent from my Nexus 7 using Tapatalk

scottjb said:
Can you make phone calls and send text messages with a T-Mo SIM in a VZW phone? Seems as if a CDMA phone would not work on a GSM network for calls and texts.
Sent from my Nexus 7 using Tapatalk
Click to expand...
Click to collapse
Yes. I haven't done it with the Moto X yet, but I did it without issue previously with both the Verizon S4 and LG G2. It's part of an FCC agreement when Verizon got LTE. It's basically GSM unlocked. Data, text, and calls work.
Sent from my XT1060

scottjb said:
Can you make phone calls and send text messages with a T-Mo SIM in a VZW phone? Seems as if a CDMA phone would not work on a GSM network for calls and texts.
Sent from my Nexus 7 using Tapatalk
Click to expand...
Click to collapse
Most Verizon LTE phones have a GSM radio and work on AT&T and Tmobile

I made a call to verify it works, and I received text messages from T-Mobile.
I also didn't have to add APNs, it seemed to figure them out.

Sprint won't work. Cause most of the CDMA bands and LTE bands are different.
Sent from my XT1056 using Tapatalk
---------- Post added at 08:06 PM ---------- Previous post was at 08:05 PM ----------
But I'm pretty sure T-Mobile will cause it is Sim unlocked
Sent from my XT1056 using Tapatalk

supr2nr said:
If it's a developer edition then "I believe" you could use it on sprint. T-Mobile is a GSM carrier and since the only option on the CDMA phones is for global GSM for international travel that you will likely not get it to work. They don't have the radios in it to work on T-mobile. Someone correct me if I'm wrong.
Click to expand...
Click to collapse
Yes, you are wrong. It does work with either a "retail" Verizon phone, or developer edition.
The big misconception is that since Verizon uses CDMA for voice and sms, that their phones only work on CDMA. This is NOT True.
Because Verizon's 4G LTE phones are "global" they support the same GSM/GPRS/Edge bands as ATT and T-Mobile for voice and data so they can be used globally on GSM carrier networks. Another little plus is that due to the FCC rules around their 700Mhz spectrum, they are SIM unlocked, so they happen to work with ATT and T-Mobile sim inserted. Since ATT uses the same bands for HSPA and HSPA+ as they do for EDGE, you can get HSPA speeds. In areas where T-Mobile's "network modernization" has refarmed their 1900Mhz edge to HSPA, you'll get HSPA speeds. In Tmobile areas that HSPA is still over AWS, you'll fall back to Edge when trying Verizon branded devices.
Using both developer and "retail" variants of the Verizon Moto X, I have inserted my T-Mobile SIM and had it work after setting the phones to "global". I've done the same with my iPhone 5, iPhone 5S, Blackberry Z10, Q10, Nokia Lumia 928, and Samsung Galaxy S4 and Note 3. Some of the phones, like the Z10 and 928 only gave me EDGE speeds the last time I tried them. The X and S4 have given me HSPA. T-Mobile recently rolled out LTE here, as putting the T-Mo Sim in my VZW iPhne 5S last week gave me T-Mo LTE for the first time. When i get time I'll have to go back and test my other devices again to see what they do.
With recent firmware updates on my X, note 3 and Galaxy S4, I have had to manually enter T-Mobile APN settings to get them to work.
scottjb said:
Can you make phone calls and send text messages with a T-Mo SIM in a VZW phone? Seems as if a CDMA phone would not work on a GSM network for calls and texts.
Click to expand...
Click to collapse
Yes it does work as long as the APN settings come down automatically to your phone, or you manually enter the correct APN settings.
On a side note... some have asked if you can do the same with a Sprint phone (since they are cdma based too). The answer is..I don't know for sure, but it really depends. I haven't looked into the sprint phones to know their "global roaming" capabilities, and what radios and frequencies their devices support. I guess as long as their phones support the quad band GSM frequencies and are (or can be) SIM Unlocked, then you can do the same with Sprint phones to get at least Edge speeds. HSPA and LTE would again depend on the frequencies the sprint phones support, and the target carrier network uses.

Thank you everybody!!!
This is excellent info and more importantly very good details. I am very grateful...
Time to the Moto X with orange accents now

themogul said:
Hi,
Currently with Big Red but will switch to "someone" once contract is up 3rd qtr next year. Most probably because of the the price and I am sick of VZ dropping back to 3G most of the time where I am.
If I get a Verizon Moto X can I later use that on TMobile. And/rather, a Verizon Moto X can be used on which carriers - all or none
much appreciated.
Click to expand...
Click to collapse
I put a T-mobile SIM in my stock 16GB Verizon Moto x. Here is what works and doesn't.
First off, 4G works! in the South Jersey area and it is Blistering fast, I have exceeded 40MB speed test downloads twice, Several in the high 30s and I am avg in mid 20s. Uploads are averaging 20+/- . Compared to Verizon this is like comparing Fios to 1999 era dial up. the best I ever got on Verizon 4G was 14 download but average between 4 and 9 !
The Network notification switches a lot between 4G, "H" mode, whatever that is, just bars and another which I didn't catch quick enough to read ?
Battery has been amazing compared to my galaxy Nexus, I got 7.5 hours of Actual "Screen on Time" which included some GPS use and an hour of music streaming total phone up time was 34+ hours. How long it will perform like this is anyone's guess, today i got about 6.5 of Screen on time. I hope this inst a trend
Now for the bad news - Using it as a Phone. Incoming calls are fine but, making outgoing is a Pain in the A$$.
When I dial a number, (which is a hassle on this KitKat dialer) it often goes to the home screen or back to the dialer. The Call Fails. I am not sure if my dialer is buggy or its a compatibility problem. the KitKat Dialer on the Moto X is an exorcise in futility. Google are you listening? Why reinvent the wheel. All I want in my Dialer is a Number Pad! and a phone book.
When I Open dialer I see Recent calls up top, the whole middle section says all contacts and is otherwise blank, the bottom has the number pad icon, History and settings dots.
Clicking the number pad icon enlarges the bottom section, which then goes all white and removes the three icons. I have to then click the back arrow and re-click the number pad icon to bring it up the actual dialer. .
At this time I can dial. and then the call always fails on the first attempt. Sometimes it takes several attempts to go through.
When I click send on the dialer the 4G disappears and I am left with just the bars. they come back when call is done but sometimes take a few minutes to do so.
If you Kill the dialer app or swipe it away, coming back to it you will have the same issues when trying to get the number pad (two attempts) if you dont, the number pad will open on first attempt. but the calls will still fail on the first try.
I also cant use the internet when in a call, whether WiFi is on or off. Is this a T-mobile problem? I could use the net in Verizon when in a call when on 4G or WiFi
The Data is set to global mode but I have tried both the other settings. On boot up I get a warning saying the SIM is not recognized which I just swipe away.
I am also having this problem. After making a call, the music player and the phones "volume" aspects cease to work., Meaning, I get no sound out of the phone, Music, notifications alarms etc.. This happens almost every time and the only fix is a reboot
I disabled all Verizon Bloat and a lot of Moto Bloat as well This could be causing some of the bugs? But i have tested several different configurations all with the same outcomes.
Hope this helps and puts an end to the - Will it work or not questions. There seem to be a lot of Net Know it all's that flat out say a Verizon Moto x wont work with a T-Mobile SIM or some other undocumented "fact"

I have the same issues as SOMFW. Disabling LTE resolves all these problems, so it seems like it's an issue with the LTE-to-2G/3G fallback for phone calls.
When I force it into HSPA+, I have both simultaneous voice and data and no dialing issues.

nethead25 said:
I have the same issues as SOMFW. Disabling LTE resolves all these problems, so it seems like it's an issue with the LTE-to-2G/3G fallback for phone calls.
When I force it into HSPA+, I have both simultaneous voice and data and no dialing issues.
Click to expand...
Click to collapse
How did you disable 4G? or Force it into HSPA+? Is there a setting I am missing?
Somebody else mentioned Manually adding T-Mobile APN is this something you did?
On My Moto,x when using the Vz SIM there is an APN labeled Verizon that appears on its own, On the TM SIM it was blank
Also, while on the TM SIM under About Phone / Status My phone number doesn't show, On the Vz SIM it is there and the Dialer works fine. But I still get the Dialer Bug, which is, When I click the Keypad icon the bottom area goes blank and I have to hit the back button and repeat it. This only happens if I swipe the dialer out of running apps list, Force close it or haven't used it for several hours.
Any Ideas?

SOMFW said:
How did you disable 4G? or Force it into HSPA+? Is there a setting I am missing?
Somebody else mentioned Manually adding T-Mobile APN is this something you did?
On My Moto,x when using the Vz SIM there is an APN labeled Verizon that appears on its own, On the TM SIM it was blank
Also, while on the TM SIM under About Phone / Status My phone number doesn't show, On the Vz SIM it is there and the Dialer works fine. But I still get the Dialer Bug, which is, When I click the Keypad icon the bottom area goes blank and I have to hit the back button and repeat it. This only happens if I swipe the dialer out of running apps list, Force close it or haven't used it for several hours.
Any Ideas?
Click to expand...
Click to collapse
These are the steps I used to turn off LTE and enable HSPA:
1) Download/install the app LTE OnOff
2) Change Mobile Network type in Settings to LTE / GSM / UMTS
3) On LTE OnOff, hit the Three-Dot menu in the top right, and select "Select radio band"
4) Select USA Band
5) Hit the Turn Off Radio button
6) Select GSM auto (PRL) under Preferred Network Type
7) Turn On Radio
The phone should show no data for a second, then 3G, then eventually an H for HSPA will be displayed.
You can also try GSM only or WCDMA preferred if GSM auto doesn't work.
Still trying to figure out how to get LTE to play nice with it.

There is a known LTE bug that causes this issue in 4.4. Check aracanexvi's thread in the Droid Ultra section. Basically we will need to leave LTE off of you want to make calls reliably.
Sent from my XT1080 using xda app-developers app
---------- Post added at 10:38 AM ---------- Previous post was at 10:36 AM ----------
Would be easier if I just shared the thread
http://forum.xda-developers.com/showthread.php?t=2591954
4.4 and Non-VZW carriers
Sent from my XT1080 using xda app-developers app

Which one are people having better luck with, at or T-Mobile?

can you put a T-Mobile ROM for it to work as well?

Using Verizon Moto X (locked Verizon retail) on ATT should be as good as using it on Tmobile, assuming I don't need LTE ?
Thanks.

AT&T and LTE?

Anyone using LTE on the Nexus 6 with AT&T? Mine from Motorola came today. I'm just getting HSPA though. When I try to select preferred network LTE, the button is filled but the text doesn't say lte. Previous phone was the 6 Plus. Any help? Talked to AT&T and they added the phone but no worky!

breezing on the LTE here

dwd3885 said:
Anyone using LTE on the Nexus 6 with AT&T? Mine from Motorola came today. I'm just getting HSPA though. When I try to select preferred network LTE, the button is filled but the text doesn't say lte. Previous phone was the 6 Plus. Any help? Talked to AT&T and they added the phone but no worky!
Click to expand...
Click to collapse
make sure you have the correct APN settings,

I had issues at first but turned on airplane mode for 5 minutes then after I turned it off I had LTE

dwd3885 said:
Anyone using LTE on the Nexus 6 with AT&T? Mine from Motorola came today. I'm just getting HSPA though. When I try to select preferred network LTE, the button is filled but the text doesn't say lte. Previous phone was the 6 Plus. Any help? Talked to AT&T and they added the phone but no worky!
Click to expand...
Click to collapse
Lte works fine and Att is bad where I live.

dwd3885 said:
Anyone using LTE on the Nexus 6 with AT&T? Mine from Motorola came today. I'm just getting HSPA though. When I try to select preferred network LTE, the button is filled but the text doesn't say lte. Previous phone was the 6 Plus. Any help? Talked to AT&T and they added the phone but no worky!
Click to expand...
Click to collapse
I have the same issue, except I was not able to even select LTE before calling the tech support.
The tech support has confirmed my data plan and APN setting are correct.
Can it be like the tech support said it might be the sim card? Or my APN setting is actually incorrect?
Anyone has solution for this issue?
If someone with LTE can post his/her APN setting, I'd be really thankful.

bigwhiteegg said:
I have the same issue, except I was not able to even select LTE before calling the tech support.
The tech support has confirmed my data plan and APN setting are correct.
Can it be like the tech support said it might be the sim card? Or my APN setting is actually incorrect?
Anyone has solution for this issue?
If someone with LTE can post his/her APN setting, I'd be really thankful.
Click to expand...
Click to collapse
Here ya go
Sent from my Nexus 6

Thanks a lot! It does allow me to use LTE.
I found out my phone switched to LTE couple minutes after I post the reply.
I had another APN setting, and it also works with the setting you provided.
So the key here is to talk to a knowledgeable tech support, and confirm your plan, IMEI, and APN setting is correct on his/her end.
The tech support mentioned my device displayed on his end was not Nexus 6, so I provided him with my IMEI, and that is probably why I was able to select LTE for my prefer network.

I'm on AT&T with an AT&T preordered 32GB. I've got my grandfathered unlimited LTE (according to the tech support chat dude) and the IMEI matches his database. I'm still only getting on average 1-3Mbps down and .02-1Mbps up.
I've double checked APN settings, tried the old "phone" APN settings, spoke with chat who advised me to try a new SIM or exchange the phone, reboots and all. I'm pretty much in DC, so coverage should be a non-issue. I've got full bars and the indicator shows "LTE". I'm at a loss and was wondering if anyone on here had any bright ideas?

I have AT&T, but purchased my unit at T-Mobile. I switched sim cards out the box, and had LTE with no issues.

Have no problems with mine (and yes, mine is a freshly rooted AT&T model Nex6--yes, you can oem unlock and root it just fine).
Of course, I also live in one of those parts of the country where the Deathstar Telco tends to have the best coverage so there's that; I'd be shocked if I DIDN'T get LTE around here
(Which is rather more than I can say for Sprint around here, but that's neither here nor there)

[Q] T-Mobile N6 on Verizon - LTE not working

Hey guys,
I bought a Nexus 6 two months ago while I was on T-Mobile. I got fed up with T-Mobile service (constantly dropping calls, not receiving all text messages, etc) and decided to switch to Verizon. I took my phone to Verizon last night, they scanned it and gave me a nano SIM. I was surprised how easy it was, given the headaches others have seemed to endure trying to get a Verizon SIM. Everything seemed to work on Verizon's end, according to the person who helped me.
The problem is, I can't get LTE to work with voice/text. If I go to Settings -> More -> Cellular Networks -> Preferred Network Type, I have 3 options to choose from: Global, LTE/CDMA, LTE/GSM/UMTS. If I select LTE/GSM/UMTS, I get LTE data, but I can't send/receive calls or texts. If I select Global or LTE/CDMA, I can send/receive calls and texts but I only get 3g data. If I go to Phone Info (*#*#4636#*#*) and set network type to LTE Only, the same thing happens...LTE data only, but no calls/texts.
This is about the limit of my ability to troubleshoot problems. What am I missing?
Thanks in advance for any help you can provide!

Did you properly configure the APN settings for Verizon? Your problem may be with that. Do a Google search for Verizon APN settings for Nexus 6...your answer may lie there.

most people have to factory reset their phones when going from another carrier to verizon, to get lte to work properly.

tankyard said:
Did you properly configure the APN settings for Verizon? Your problem may be with that. Do a Google search for Verizon APN settings for Nexus 6...your answer may lie there.
Click to expand...
Click to collapse
There were about 50 APNs when I checked. I deleted all of them and created a new one based on the following:
Name: Verizon
APN: vzwinternet
MMSC: mms.vtext.com/servlets/mms (with http, but won't let me post when typed out)
MMS port: 80
APN type: default,supl,mms
Everything else was left default. Restarted my phone. I am still only getting 3g on Global and LTE/CDMA, still can't make calls with LTE/GSM/UMTS.
simms22 said:
most people have to factory reset their phones when going from another carrier to verizon, to get lte to work properly.
Click to expand...
Click to collapse
I did a factory data reset this morning.

There are at least 5 - and as much as 10 - APN setting setups for Verizon. You may have to try them all. I put a Verizon Sim in my N6 and they all showed up in the list of APNs. When you deleted them you may have deleted the one most compatible with the N6. You may have to reset, put back in the Verizon Sim, and hope they all repopulate the APN section. If not, you'll have to search for them all and try each setup.

I can reset the default APNs and they will all show up again...without having to factory reset.
Do I need to reset the phone without the Verizon SIM inserted? I left the SIM inside when I reset this morning. I only ask because you mentioned resetting the phone and then re-inserting the Verizon SIM.
Thanks for your help.

I generally remove Sims and SD cards (not applicable here) when doing a reset as my line of precaution. Since you are able to restore the default APNs, do so, and try each one till you get the proper one.

Tmobile has their own software version/radio pushed out to Nexus 6's. You can try loading the Verizon software version/radio and see if it works.
Try this one: http://www.randomphantasmagoria.com/firmware/nexus-6/shamu/vzw/

tankyard said:
I generally remove Sims and SD cards (not applicable here) when doing a reset as my line of precaution. Since you are able to restore the default APNs, do so, and try each one till you get the proper one.
Click to expand...
Click to collapse
I found the problem. When the Verizon rep installed the sim, she immediately dialed *228. After googling LTE problems, I've found out that *228 on a LTE phone is a very bad thing. I got a new SIM and everything is now working.
Thanks again!

StickR6 said:
I found the problem. When the Verizon rep installed the sim, she immediately dialed *228. After googling LTE problems, I've found out that *228 on a LTE phone is a very bad thing. I got a new SIM and everything is now working.
Thanks again!
Click to expand...
Click to collapse
Dam shame that a rep didn't know better
Sent from my Nexus 6 using Tapatalk

Mi 9 cant activate with LTE on AT&T network?

So I got a Chinese edition phone with band 2, 4, 5, 12, and 17 to fully support both TMobile and ATT network. The Global edition was missing band 17 for ATT so I didnt want to go that route. Been going back and forth with ATT a bit for the past few days since my device came in. The phone shows up and an "unknown device" on their network when we tried adding the IEMI. It will get UMTS (2g) and HSPA+ (3Gish/4G), but will not connect to any LTE or GSM. The phone supports GSM fine, so its strange that it wont do normal cellular connection over that, it will only do cellular over UMTS. The device wont detect as an LTE device and so the sim wont activate LTE on it.
Anyone else with ATT have this issue? And were you able to resolve it somehow?
Or those with TMobile in the US, are you able to activate the phone fine and get full coverage and LTE working?
I messed around with the connection settings in the *#*#4636#*#* menu. Only the "LTE/TD-SCDMA/UMTS" and "LTE/TD-SCDMA/WCDMA" will work properly at all. Both options give me UMTS for cellular, and HSPA+ for data. Of the 4 APNs that ATT uses, only the "ATT Phone" will work at all. The standard LTE APN "NXTGENPHONE" will leave the phone with no data or cellular service. This is related to the phone not being detected as an LTE device and the SIM not activating as such.

I simply put my AT&T sim in my China version and it worked straightaway. I didn't have to do anything else.

I am on Cricket, which leases service from AT&T, so I should know if it works once it comes Tuesday.

Just for perspective, I got a EU version of the Mi 9. Popped in a T-Mobile sim and it worked out of the box. Try the other sim slot. Could be your sim card if not.
Try these codes in Dialer. See if that helps anything.
VoLTE *#*#86583#*#*
VoWIFI *#*#869434#*#*

I was just making an ATT account so no previous activations or sims. So that could be the issue. I will try activating a sim with an old phone and then move the sim over. Or since it is the same hardware as a Galaxy S10, ill see if I can find a store that will activate a sim with a floor model S10 and then let me swap the sim into my Mi 9

Straight talk (ATT sim) lte without issue. no programming necessary , I have the global model though

jvs60 said:
I simply put my AT&T sim in my China version and it worked straightaway. I didn't have to do anything else.
Click to expand...
Click to collapse
airwebber said:
I am on Cricket, which leases service from AT&T, so I should know if it works once it comes Tuesday.
Click to expand...
Click to collapse
MixEvo said:
Straight talk (ATT sim) lte without issue. no programming necessary , I have the global model though
Click to expand...
Click to collapse
Where did you guys buy the China version from?

US mobile white SIM from starter kit (T-Mobile) works well with LTE on Chinese model of Mi 9. Black one (Verizon) technically works, registers in the network and enables data, but Verizon refuses the IMEI as non-certified brand of the phone. Trick with activation on the iphone first and switching to xiaomi did not work, service gets cut off, when trying to make a call, it keeps dropping. AT&T based: Cricket and Straight Talk work just fine too.
---------- Post added at 06:15 AM ---------- Previous post was at 06:14 AM ----------
StDevious said:
Where did you guys buy the China version from?
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Aliexpress https://www.aliexpress.com/item/Ori...222.html?spm=a2g0s.9042311.0.0.58b14c4dxws9df
You'r welcome =)

StDevious said:
Where did you guys buy the China version from?
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I bought my Transparent Edition from Tradingshenzhen.com

Neolo said:
US mobile white SIM from starter kit (T-Mobile) works well with LTE on Chinese model of Mi 9. Black one (Verizon) technically works, registers in the network and enables data, but Verizon refuses the IMEI as non-certified brand of the phone. Trick with activation on the iphone first and switching to xiaomi did not work, service gets cut off, when trying to make a call, it keeps dropping. AT&T based: Cricket and Straight Talk work just fine too.
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Thanks for the info.
I was wondering about Verizon, since it support some CDMA bands and support 2 out of 3 of the LTE bands they use (doesnt support B13). Unfortunately I never tried it myself since half the coverage near me uses the band this phone doesnt support on Verizon.
I went and got my ATT account updated to an old Nexus 6 IMEI number and it got LTE on the N6. I then took the sim and put it in my Mi 9 and now the Mi 9 has LTE. So for anyone just getting this phone, you must have an IMEI on your account that is recognized as an LTE phone. If you try to add the IMEI of the Mi9 it is not recognized by ATT and wont provision LTE.

IMEI spoofing does not work with Verizon, as they simply ban the device. They call it “non certified”. Bands are seem ok.

StDevious said:
Where did you guys buy the China version from?
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I been purchasing from liaow. Never ran across a issue with them

I've been having the same issue, with a recently-bought (last week arrived) Mi 9 Global on AT&T postpaid. LTE showed up and worked fine day one, now network speeds are dropped down to 3.5G speeds. Anyone else have success with getting LTE on a fresh SIM?

EniGmA1987 said:
So I got a Chinese edition phone with band 2, 4, 5, 12, and 17 to fully support both TMobile and ATT network. The Global edition was missing band 17 for ATT so I didnt want to go that route. Been going back and forth with ATT a bit for the past few days since my device came in. The phone shows up and an "unknown device" on their network when we tried adding the IEMI. It will get UMTS (2g) and HSPA+ (3Gish/4G), but will not connect to any LTE or GSM. The phone supports GSM fine, so its strange that it wont do normal cellular connection over that, it will only do cellular over UMTS. The device wont detect as an LTE device and so the sim wont activate LTE on it.
Anyone else with ATT have this issue? And were you able to resolve it somehow?
Or those with TMobile in the US, are you able to activate the phone fine and get full coverage and LTE working?
I messed around with the connection settings in the *#*#4636#*#* menu. Only the "LTE/TD-SCDMA/UMTS" and "LTE/TD-SCDMA/WCDMA" will work properly at all. Both options give me UMTS for cellular, and HSPA+ for data. Of the 4 APNs that ATT uses, only the "ATT Phone" will work at all. The standard LTE APN "NXTGENPHONE" will leave the phone with no data or cellular service. This is related to the phone not being detected as an LTE device and the SIM not activating as such.
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I got the Chinese version and I'm in the US. And I I have the straight talk T-Mobile sim and everything works like it is suppose to expect my internet. It says its 4g but it is very very slow. Any ideas?