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unlocked AT&T LG G2 does not has Tmobile data

Hi, this is my first post on XDA, i bought an unlokced ATT&T LG G2 last month and use it on T-mobile network, i was able to make calls and send/receive messages fine. i just changed my family plan from Classic to Simple Choice yesterday, and we were supposed to have unlimited data with 1 gb of 4g lte. When i tested the data plan on my sister's iphone 5, she was able to get online with the LTE icon on the notification bar. However, when i tested on my phone, it does not show H, 2G, 3G, 4G, or 4G LTE and i was not able to get online. i have contact T-mobile support, and they said my phone was already registered, all the information was provided correctly but i still has no luck getting my phone online. I have played with the data setting such as turning it on and off, the airplane mode and even restart my phone but i still have no luck. Does anyone has this problem? please help me. :crying::crying:

Double check tmo APN settings?

Sfkn2 said:
Double check tmo APN settings?
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Thanks, i totally forgot about that

[Q] new to verizon galaxy S5

Just bought verizon galaxy S 5. Changed SIM to AT&T from straight talk. First of all was that a mistake? When ever i leave a wi-fi area the phone goes to emergency calls only. Email and text stops as well. Can't get voice mail to work anywhere
Would appreciate any help.
Thank you

Just a thought, go to settings /more networks and make sure you have the correct network checked

New to verizon galaxy s 5
The network was correct . Wondering if im in a bad area. My Iphone 4 works fine. Might be AT&T

jokey321 said:
Just bought verizon galaxy S 5. Changed SIM to AT&T from straight talk. First of all was that a mistake? When ever i leave a wi-fi area the phone goes to emergency calls only. Email and text stops as well. Can't get voice mail to work anywhere
Would appreciate any help.
Thank you
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jokey321 said:
The network was correct . Wondering if im in a bad area. My Iphone 4 works fine. Might be AT&T
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Wait... you put an AT&T sim in your phone? This is a Verizon forum. If I misunderstood, please tell me.

Just to be clear because you didn't state it in your post, you must unlock your phone prior to using a non-Verizon SIM. You can sometimes get these unlock codes from Verizon but you can also buy them online. I've used GSMLiberty.net with success before. After that, you should be able to pop in your SIM from the new carrier and begin using it right away. In some cases, you may need to manually add the correct APN for your carrier. Find these settings under Settings > More networks > Mobile networks > Access point names. Click the little plus icon in the top right and manually enter AT&T's APN information. You may need to Google that as I don't know AT&T's APN info.
I use my Verizon S5 on T-Mobile's networks with absolutely no issues, I assume it would be a similar experience for AT&T as well. For me, I put my T-Mobile SIM card in and could make calls and receive texts, but mobile data and MMS was not working properly until I manually added the correct APN information. After that, MMS, 4G LTE data and everything is working flawlessly.

You do not need an unlock code for a LTE Verizon phone. These phones are already unlocked. One must set the correct APN.
Do not buy an unlock code!
I have used my Verizon S5 with att and t-mobile.
Good luck.
Sent from my C6806_GPe using Tapatalk

thank you all
Thank you for your posts. Most of the phone works. When I leave a wi-fi area my phone goes to emergency calls only. When I go back to a wi-fi area the normal call service works again. I'm new to verizon and samsung. Wanted to use straight talk because i didn't feel like paying a fortune for service. I'll get it figured out some way.
Thank you again

Uscellular g4 with tmobile sim

I dont know if anyone else has tried this but i popped in my tmobile sim into my uscellular g4 and had service the only thing i had to add was the apn

This is without a sim unlock bought the phone 2 days ago and been using it was going to get a sim unlock but apparently it works just fine without it on tmobile.

Just to show that its a uscellular g4

Are you getting full speed LTE?

Yes doesnt seem to be a problem only thing i noticed is it wont let me make calls and or text but it will let me use data

When i make a call it tells me its an incorrect sim so i think if i unlock it will allow me to make calls and texts but as i said previously itll let me use data no ptoblem

I had heard that some CDMA phones may not allow phone calls or texts, you should look into finding a way to disable the CDMA, it may or may not work.
I think calls and texts are going through the CDMA and not GSM.

I have to agree i think if i sim unlock it that it will allow me to bypass the cdma part of the phone uscellular said after i pay the phone off i could get the sim unlock for it

No need to sim unlock, it already is, most new phones from verizon are already sim unlocked and some other carriers as well, only help is probably trying to disable the CDMA in the hidden menus and probably enabling gsm.

I agree with @Arctic Prodigy, you should be able to make calls texts, just by changing something in Settings. On my One Plus for instance (the only device I have handy, sorry) go to Settings > Mobile Networks > Preferred Network Type and then change from CDMA or whatever it is set to, to GSM/UMTS or something similar to that if it's available. To reach this menu on your device it may be slightly different in Name or location but it should be there somewhere. A friend of mine had a VZW s4 and I told her she could use a straight talk sim in it. She had issues at first but I do remember I changed this setting I mentioned above from whatever form of CDMA setting it was on to GSM and it has been working fine ever since!
I would think if it were sim locked, then you most likely wouldn't get data after setting Apn. This tells me it sees the tmo sim and that you have active service, so it is allowing phone to use the data connection.
Hope this helps!
Sent from my A0001 using XDA Free mobile app

It has these and i changed itto global and gsm/umts and still vouldnt make calls or texts

It tells me when i make a call its an invalid sim even after changing it to global or gsm/umts

But like i said it lets me use data so ill have to do some digging i used to dev for the note 4 so ill have to learn lg's a little shouldnt be to hard

I know the T-Mobile iPhone 6 has CDMA as well but it is disabled, regardless of changing in the settings to gsm/umts it still maybe trying to go through CDMA, you need to disable CDMA and enable gsm in the hidden menus and if you get it to work that way you may need to reset it if you reboot phone.

The problem is i havent been able to ascess the hidden menus ive tried all the known lg hidden menu codes

I am positive it will happen soon, I have seen a posting somewhere here for the hidden menu but it still might not be accessible just yet, but a developer will get it soon enough, I know for the LG G2 or G3 the CDMA phones all have been patched to get gsm. It's only time now.

Well if i can put a few heads together that have a uscellular G4 im sure we can access the hidden menu for the uscellularG4

Try 277634#*#
Also found this link http://androidforums.com/threads/how-to-turn-4g-on-off-access-hidden-menus.638374/

That doesnt open anything at all for me

It seems to be working only on some of the G4's but not all.

International S8 (SM-950FD) On Verizon

Hey guys,
I bought the G950FD on eBay so that I could root and tweak it the way I always have with my previous phones. I use total wireless which is on Verizon towers and have gotten the phone to connect just like it should, text, receive/make calls, and use data. To do this, I used the Flashable CSC Collection here to switch the CSC to VZW and it worked for a while, but after restarting I started to get some problems that I can't sort out.
1. Calls do not work anymore - I can't make or receive them at all. Dialing a number just says "Dialing" with some zeros below it, and calling my number goes right to voicemail.​2. Data cuts out sometimes and shows no signal. Recently, I tried to search for carriers and reconnect to Verizon but now I can't get a connection at all without restoring a backup.​3. Other observations: Using a signal info app, it seems like I only see band 1 and it is usually very slow. CDMA obviously doesn't work, so maybe that's why I can't register on the network anymore, but why did it work when I first booted up? I can't change the APN settings after switching to VZW CSC and also can't see an option for VoLTE, but that must be working right? Only some ROMs seem to work with the VZW CSC and allow me to connect to the cell towers. Changing the network mode does not do anything and just reverts back to 2G, which doesn't make sense because 2G shouldn't be possible. None of the codes that can be entered into the dialer to run the activities have worked or helped at all. When connected to WiFi, the no signal bar shows 4G connectivity and the signal bars reappear but I am still not connected.​
So, what can I try and does anyone have knowledge to share about cell towers, SIMs, registering on the network, or anything else relevant to my situation? I am completely stumped and would love any input that you guys could give me and future 950FD owners who might have this issue.
I'm looking forward to hearing what you guys know,
Joe

Only verizon phones work on verizon, you can't use a non-verizon phone on its network even if its supports its frequencies. Lte on your s8 is compatible with verizon's but after it worked for a bit they disabled your imei from their network, nothing you can do about it.

peachpuff said:
Only verizon phones work on verizon, you can't use a non-verizon phone on its network even if its supports its frequencies. Lte on your s8 is compatible with verizon's but after it worked for a bit they disabled your imei from their network, nothing you can do about it.
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Thanks for the reply! I do not think they have blocked my IMEI because I just restored a backup and everything works again. I believe it has something to do with the settings on my phone or possibly a bug with Android/changing the CSC because changing the network settings cause crashes, disconnects, and other weird behavior.

peachpuff said:
Only verizon phones work on verizon, you can't use a non-verizon phone on its network even if its supports its frequencies. Lte on your s8 is compatible with verizon's but after it worked for a bit they disabled your imei from their network, nothing you can do about it.
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Lol don't give misinformation, they don't do this, in fact I'm pretty sure forcing all users to have phones obtained through Verizon would be completely illegal for a Telco to do. VZW doesn't even know what type of phone you have unless you register it and even if you do they don't care.

AT&T LG G6 Keeps Hanging Up

No idea why this started happening but every time I try to make a phone call, it'll hang up immediately. Checked all the settings and nothing has been changed or altered. However, I am still able to access the internet and send text messages. When I try to check my remaining voice and data by entering *777*1#, it'll say, "Connection problem or invalid MMI". It just doesn't make any sense. Contacted Airvoice Wireless and have yet to hear back from them. Has this ever happened to anyone else?

It must be a whitelisted model if it's running on AT&T's network. 4G VoLTE must be enable in hidden settings as well. A new sim card may be needed. AT&T stopped supporting 3G altogether.
Model whitelist (more may have been added since this doc release):

blackhawk said:
It must be a whitelisted model if it's running on AT&T's network. 4G VoLTE must be enable in hidden settings as well. A new sim card may be needed. AT&T stopped supporting 3G altogether.
Model whitelist (more may have been added since this doc release):
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Yeah. My phone's model is whitelisted. I have the H871 variant of the LG G6. After doing some research, it would seem I need a new SIM card (as you mentioned). Nothing I have tried has worked so far. I even went as far as factory resetting my phone. And of course, it did not fix the issue. It's the SIM card. I did access the hidden settings but didn't really pay much attention to the 4G settings. I'm going to go back to that and take a closer look at those options. If there's a VoLTE option, that might do the trick.

Gurren Lagann said:
Yeah. My phone's model is whitelisted. I have the H871 variant of the LG G6. After doing some research, it would seem I need a new SIM card (as you mentioned). Nothing I have tried has worked so far. I even went as far as factory resetting my phone. And of course, it did not fix the issue. It's the SIM card. I did access the hidden settings but didn't really pay much attention to the 4G settings. I'm going to go back to that and take a closer look at those options. If there's a VoLTE option, that might do the trick.
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That's the problem if it was running on 3G. My Note was running on 4G VoLTE when I got it so the sim card and settings were correct.
4G VoLTE must be enabled.
AT&T advanced tech support can probably help you. May take more than one call to get someone that knows what they've doing though.

blackhawk said:
That's the problem if it was running on 3G. My Note was running on 4G VoLTE when I got it so the sim card and settings were correct.
4G VoLTE must be enabled.
AT&T advanced tech support can probably help you. May take more than one call to get someone that knows what they've doing though.
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I get my service from AirVoice wireless but have yet to hear back from them. What I found out by messing around in the secret menu is that when I choose WCDMA Preferred, everything works just fine. I can call, text, and access the internet. On that setting, 4G is displayed up top. What I found out was that any setting that displays 4G LTE will block my ability to make a phone call. If it says 4G, then I am fine. The problem with this is that everything will reset when I turn off my phone. So, it's pretty annoying having to set it every time. Is there any way to make my selection permanent?

Gurren Lagann said:
I get my service from AirVoice wireless but have yet to hear back from them. What I found out by messing around in the secret menu is that when I choose WCDMA Preferred, everything works just fine. I can call, text, and access the internet. On that setting, 4G is displayed up top. What I found out was that any setting that displays 4G LTE will block my ability to make a phone call. If it says 4G, then I am fine. The problem with this is that everything will reset when I turn off my phone. So, it's pretty annoying having to set it every time. Is there any way to make my selection permanent?
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Not sure. The carrier may need to do a reset on their end.