yashsingh1/xdaforums huggingface dataset:
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] grotz497:
Right, that's exactly the setting that I can't change to anything other than WDCMA preferred. I can open the menu to select "LTE/WCDMA, LTE/GSM/WCDMA, GSM/WCDMA preferred" but anything I select just goes back to WCDMA preferred

Edit: Thanks for the quick reply!
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Who is your provider and what is the current modem you're running? Also make sure the LTE toggle isnt selected turning off LTE...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] grotz497:
Provider is AT&T, modem is UCDLK3, Ktoonsez kernel. Issue was also present on Carbon ROM
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
All the same stuff here... Slim 4.2.2 with LK3 modem, on AT&T... I'll post my APN in a second, have to screenshot it... in your wipe steps, did you include a format /system? Also the dialer code doesn't work for me, I have to go through the menus...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Re: &lt;&lt; GUIDE & Q/A AOSP LTE Issues US / Canada &gt;&gt;

Insert sig here...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
any of that help?

If it still won't let you switch, try wiping the phone again, and including a format /system and reflashing
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] grotz497:
Yep, I had all of those settings in there previously. It might have something to do with the LTE switch which, because I didn't think it would default to 'off', I never thought to look at.

I when I went to bed, I had 3g. When I woke up and through the whole drive to work, I had 4g (speedtest showed something like 17down / 7up). I have since turned off/on the phone and all I can can get is 3g...making sure the LTE toggle is on of course :)

Still won't let me select anything other than GSM/WCDMA preferred. I can click other things, but the setting will only ever display GSM/WCDMA.

Thanks for your time & screenshots! I'll probably just reflash later and if that doesn't work wipe /system and reflash again...and if that doesn't work go back to TW ROM or something...which would stink haha
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Are you still not getting LTE?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] grotz497:
Re: &lt;&lt; GUIDE & Q/A AOSP LTE Issues US / Canada &gt;&gt;

Well, after wiping selecting the "e rase everything that's ever been on your phone" option in TWRP, I flashed Carbon again and I was getting LTE!

Now I'm just having IMEI problems haha. No signal right now (sending over WiFi), and process.phone and process.settings FC whenever I have an incoming call or try to check 'phone status' to see if IMEI shows 0000000. It seems that about every other reboot I lose IMEI...

But that's a topic for another thread haha. Glad I made a backup ;) thanks for checking in
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Shadowla05:
Ok so this is how im set up right now, and i dont have LTE in my area, in this settings if i change the apn name to phone i get semi data talk/internet/ send text but cant received anything

I installed this rom from stock i wiped data/cache and delvick cache and also formated system under mount in cw recovery

ATT Carrier

APN Settings:

Name: ATT PTA

APN: pta

MMSC:http //mms dot.mobile dot att dot net [Cant post Links yet]

MMS Proxy: proxy.mobile.att.net

MMS port: 80

MCC: 310

MNC: 410

Auth: none

APN type: default,mms,supl,hipri
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
I believe you forgot a 'c' in the MMSC

http://mmsc.mobile.att.net

And your Network mode is LTE/GSM/WCDMA?

ROM should have been setup to use AT&T with no changes...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Shadowla05:
Yes sorry typo the 'C' is there and yes its set for LET/GSM/WCDMA
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
You shouldn't have had to change anything to get it working for AT&T... This is the stock messaging client?, and your IMEI is intact? If it didn't work at all right after flashing with no changes, and everything looks exactly like the screenshots a couple of posts back, I would say wipe the phone again per the ROM's OP and include a format internal sd to get rid of the old TW apps data (not likely to cause the issue)...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Shadowla05:
yeah IMEI is good and i am using stock messaging app, I all ready wiped the phone and even when back to stock formating everything and i still cant get it to work. I been tring to get it to work for 3 days now on stock everu thing works perfect.

EDIT: fix it my self created a new APN named it ATT and under apn i put phone thats it nothing more now im getting the 3g h+ and all data is working perfect.

Thanks to Quasimodem for your time and efford
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Glad you fixed this
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] jeffrey1790:
I'm on Bell, and have the same problem.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
So this is just a losing signal issue, not a specific thing?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Enraged Medic:
Here is my dilemma: my phone is currently running PAC-man and I have all of the correct settings for LTE. I have the network mode set to LTE/GSM/WCDMA and the ATT pta APN settings selected. I have had zero issues with network switching between LTE and H+ for the past month.

Tonight I went to a hockey game in Downtown LA and once I was inside of the Staples Center my LTE signal wasn’t that great and was consistently switching between LTE and H+ (killing the battery). So I decided to switch over to the H+ APN settings. It switched over and the data bars turned blue indicating a network connection. However when I tried to check gmail, facebook or instagram it wouldn’t load. So I decided to switch back over to LTE pta APN. It connected and data bars turn blue and checking the above apps worked. So I just ran with it.

Now, when the game was over and I was walking out of Staples Center I looked at my phone and noticed it was connecting to LTE and suddenly drop the signal. It continued to do this all the way back home (I have a pretty solid LTE footpath all the way home from Downtown LA). I made a nandroid of the current PAC-man rom and decided to see if I flashed a TouchWiz ROM (yes, I did a full wipe first) that maybe it would correct the issue. No avail. When it would load the initial google setup/login the data connection would do the same thing (nearly acquire a signal and drop). I even tried a fresh flash of PAC-man and the same symptoms occurred.

Does anyone know WTF happened or what is going on? Do I have to call ATT and find out if they need to check or switch something on their end? Is my SIM card fried? Many thanks in advance!!
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Re: &lt;&lt; GUIDE & Q/A AOSP LTE Issues US / Canada &gt;&gt;

What modem is your phone right now?

Insert sig here...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Enraged Medic:
Modem/baseband is UCDLK3.

I haven't messed with any of the radios/baseband. Is there an update?

edit: I checked under settings>status and my IMEI shows a number sequence so I don't believe it's that.

edit#2: So I went ahead and turned off airplane mode after letting it sit over night and it connected again without any issues. I'm baffled. I really am. But it's alllliiiiive! LOL Do you have an idea as to WTF happened?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Must be trolls... LOL Your guess is as good as mine... Guess it just needed a push...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] Enraged Medic:
Re: &lt;&lt; GUIDE & Q/A AOSP LTE Issues US / Canada &gt;&gt;

Damn those GSM trolls! Thanks for answering to my post anyway!
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] mrnovanova:
Re: &lt;&lt; GUIDE & Q/A AOSP LTE Issues US / Canada &gt;&gt;

Hi guys. What determines the speed at which my phone reconnects to lte after a call. Since lte is for data only the phone switches to 3g when you get a call. In my case it reverts to 4glte after about 30 seconds to a minute. Is it because of the antenna? The kernel? Is there a way to make that transition instantaneous? So that if I get a call while watching you tube, my phone doesn't go back to a lower definition image.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] CanuckinPA:
I'm not sure if this is the correct thread to post my problem but here goes.

It seems as though my network shuts down when the phone goes into sleep mode. When I turn on the screen, the 4G symbol is missing and comes on a few seconds after the screen. I'm not sure that it's checking for email while it's in sleep mode.

OP listed the ATT settings as:

Name: ATT PTA

APN: pta

MMSC: http://mmsc.mobile.att.net

MMS Proxy: proxy.mobile.att.net

MMS port: 80

MCC: 310

MNC: 410

Auth: none

APN type: default,mms,supl,hipri

My phone is running Android 4.1.1, kernel v2.0.21-274808

The APN setting shows:

Name: ATT Phone

APN: Phone

the rest on the list are the same.

Also shows:

APN protocol is IPv4

APN is enabled

So, my question is --- is there a problem with these settings? If so, how do I change it?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Is that an AOSP ROM, or TW? I'm not seeing any setting in my ROM to disable the data when sleeping...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] CanuckinPA:
I'm not sure. :confused:

I had a ROM (Cyanogen Mod IIRC) but flashed back to a rooted stock ATT ROM several months ago (darned if I can remember whose ROM) but I got it here on XDA.

Sorry I can't be more specific. I have just enough tech knowledge to be truly dangerous. :o
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Check and see if battery saver is enabled... Your APN and everything posted looks fine, I believe TW has a setting somewhere that will turn off data when sleeping, it could be the battery saver option... Any TW users out there know?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] CanuckinPA:
I've been through all of the settings and can't find any battery saver that could lead to the issue. I talked to a rep at my local ATT store yesterday -- he said the phone allows the network to run in the background when it's in sleep mode. My wife's S3 apparently doesn't have the same issue however. :confused:
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] chuckado:
I recently install CM 10.1 M2 from 3/04. I have not done too much testing but it seems like I am not getting the same 4g LTE signal strength and the speeds are much lower is this to be expected over the stock rom. I have also changed my APN as it shown in the first post. Thanks for any insight.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Is your phone showing 4g at the top and this is just a speed issue?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] chuckado:
It does show 4g at the top in the usual places it just doesnt seem as fast as it usaully is. I did not do any speed tests when I had my stock rom but I am only getting around 3mbps. Is there a know speed difference between stock and cyanogenmod 10.1?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Not supposed to be, I get the same on every ROM... Try flashing LK3 modem if it's AT&T or whatever the latest is for your carrier, and also another location if it's still slow...
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] chuckado:
I do have AT&T and upon looking in the setting I have the LK3 modem. Maybe it is just me and I am imagining things. I will keep testing in different places.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
It really could be location, I get 5 - 8 at my house, and 30+ anywhere else....
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] CanuckinPA:
Quasi:

Here's the latest on my issue. I flashed Dandroidv2.8 LL1, but the no network while asleep issue appears to continue.

After flashing, the access point has gone from ATT Phone to ATT PTA. All of the settings are as you listed in the OP, with the exception of the APN Type. Mine shows only default, mms and supl.

I'm still unsure if the AquaMail app is the issue and am waiting for help on the app forum.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Have you tried wiping the phone and not restoring apps until you've tested it?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] SpiderJames:
Hey guys I recently flashed CM 10.1 but Im not getting 4G. Im getting H+ and 3G. When I go to mobile networks it wont let me switch to LTE in network mode, it always switches back to WCDMA preferred. Ive wiped my device clean before I flashed it (it was the first time I ever flashed a custom rom). Any input would be great. Ive done the APNs and stuff in the first post. Even when I dial the "*#*#*" thingy and get to the menu, it still wont let me switch from "WCDMA preferred." It always switches back. Thanks guys.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Choose LTE / GSM / WCDMA... Did the stock ROM say 4g LTE?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] SpiderJames:
I believe it did. I know I should choose that, the only problem is when I select it on my phone it automatically switches back to WCDMA Preferred for some reason.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] AtoZ0to9:
Have you tried flashing the lastest modem for your carrier?
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] SpiderJames:
Thanks for the quick responses. So I tried flashing the latest modem but that didnt fix it. I also did a factory reset and flashed a new CM build and its still stuck on 3G. It seems the issue is that I cant change the Network Mode from WCDMA preferred. Whenever I try to change it it changes right back. I changed my APN to the lte one but that doesnt seem to do anything.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] clev001:
so I just wanted to share my experience here hoping it might help some of you.

I'm a Canadian user (unlocked Bell phone on Fido) and I was experiencing most of the issues described here. Mainly LTE would work fine on Stock Rooted ROM but as soon as I flashed any AOSP ROM i would have issues connecting to Data. At first just 3G would work, but once I corrected the apn settings I would get no data.

followed alot of the steps outlined earlier in the post with no luck. I would then have to flash back the Stock Rooted ROM to get LTE working again.

long story short, I was using the wrong recovery to flash the ROMs. I had used the regular CWM recovery and now finally flashed the CWM Recovery for SGS3 LTE Variants

http://xdaforums.com/showthread.php?t=1737446

and after this I have been able to flash AOSP ROMs with no issue. LTE started working after correcting the apn settings and checking the LTE / GSM / WCDMA settings.

Settings are sticking after reboot now, GPS is working (no flashing on and off while on Mobile Data), mobile data is working after disabling wifi and I'm getting 4G again!

Happily using the latest Carbon ROM now :)
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] CanuckinPA:
That seems to have solved the problem.

Thanks :good:
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] SpiderJames:
I tried using the CWM you gave in the link, but it seems to be outdated as RomManager wasnt even recognizing I had it installed, and it wouldnt flash CM 10.1 nor gapps. But it did install CarbonRom, but still WCDMA preferred is sticking. I feel like Ive tried everything :/ I think Im gonna throw in the towel on this one, I honestly have no idea what else I can do at this point.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] clev001:
I experienced the same issue with my phone when installing ROMs through RomManager/GooManager; (maybe the recovery is being updated somehow? - hopefully someone more experienced can shed some light on this).

The only thing that worked for me is to install the recovery for the S3 LTE variants and then flash ROM from my SD card...

Once flashed; the first thing I would do is disable data connection > update my LTE APN > set Network Mode in settings to LTE/GSM/WCDMA > then dial *#*#4636#*#* and set band to LTE / GSM / WCDMA.

after all that I enabled Data connection and wait for it to connect to LTE....usually about 1 min.

I was in the same boat as you; as far as I can tell this is what fixed my issues as it was the only thing that changed in my numerous attempts of flashing stock ROM (mrRobinson's method), installing recovery and then a different ROM.

I'm thinking that maybe the major difference is not actually the recovery version but rather the way it was installed via Odin (using Team Epic's instructions) as opposed to via adb
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] SpiderJames:
Thanks for your help dude. I may give it one last shot in a bit!
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] SpiderJames:
Well its weird how things work. I decided to go to network operators and choose at&t and what do you know? It let me choose lte after. I made sure I selected the right APN, disabled and reenabled data and poof, 4G lte. Knew it was something obvious he he.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] YoHoJo:
I wish to stay on 3G ONLY and not be on LTE.

However my Network Mode is always stuck in: LTE/ GSM/WCDMA after a reboot, I always have to manually: Click Network Operators, Select AT&T, and only then can I select WCDMA preferred, allowing me to stay on 3G only connection.

After every reboot, I must redo these steps in order to get back into the state I want.

If I just try to change the NetWork mode to anything else, it instantly changes the mode back to LTE/ GSM/WCDMA.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] mrnovanova:
What network ate you with? Just put in your 3g APN. This way it'll never connect to LTE.

Sent from my SAMSUNG-SGH-I747 using Xparent Cyan Tapatalk 2
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] YoHoJo:
I am on AT&T, mind telling me how this is done?

Is this when I search for networks and pick one/same screen as that?

It seems no matter what I try, after a reboot nothing sticks.

Edit:

Found where to do it, just need to find what settings to input on the APN screen now.

Edit:

No matter what APN I switch around to, my Network Mode is stuck/fixed on LTE/ GSM/WCDMA unless I click Netword Operators and manually pick AT&T and THEN I can change network mode to the 3g only ones :/. And this only sticks until a rooboot, at which time I must repeat the process.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] mrnovanova:
http://www.phonebuff.com/2012/07/configure-apn-settings-for-android/

Sent from my SAMSUNG-SGH-I747 using Xparent Cyan Tapatalk 2
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] YoHoJo:
My APNs were just fine and exactly like all of the ones I found online, yet my network mode is still stuck on LTE/ GSM/WCDMA unless I do the steps I said above :/.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] mrnovanova:
Sorry. I'm not with AT&T I'm with rogers an we have a dedicated LTE APN maybe AT&T does too maybe not. I would need someone with AT&T to chime in on that matter.

Sent from my SAMSUNG-SGH-I747 using Xparent Cyan Tapatalk 2
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] derberts:
Just thought I'd post this as it might be the fix you need for your lte.

I was having lte issues with every rom I tried. Naturally, I flashed back to stock ICS as this would usually fix any problems I ever had with my phone. Unfortunately, I would still only get HSPA and nothing more. I then tried the format trick (*2767*3855#) which also did not help. Finally, I tried scanning network operator in my mobile settings but again, no luck. I decided I'd triangle away and take my phone in for repair today as I thought for sure it was a hardware issue. Before going to Telus, I thought of one last hail Mary, my buddy at work has a note and is on telus as well, so we switched sims and voila, LTE was finally back on my phone and he wasn't able to get LTE on his phone using my sim card. So I went to telus and got a new sim card and now my lte issues are gone, I've been locked on since leaving and getting double the speeds I used to get before I started having issues.

I will add that the sim that was failing me was the one that came with my S3 when I bought it from Telus, so it wasn't like I was using a sim from an older phone that wasn't lte capable.

I hope this helps anyone who might be having lte issues and if it does, please let me know in this thread.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] DLogan24:
LTE/4G/3G Issue

So I'm running CM10.1 on baseband i747MVLDLK4 on Samsung Galaxy S3(of course) Rogers. I had to mess around with the APN settings a bit for it to start showing 4G, because previously it was showing 3G. My current APN settings are:

(Deleted all other APNs)

Name -Rogers LTE

APN - ltemobile.apn

Proxy - <not set>

Port - <not set>

Username- <Not set>

Passwors - <not set>

Server < not set>

MMSC - ttp://mms.gprs.rogers.com

MMS - proxy 10.128.1.69

MMS - Port 80

MMS protocol - Wap 2.0 or Blank <<<-- This option does not show for me at all

MCC - 302

MNC - 720

Aythentication type - < not set>

APN type - *

I live in Toronto, as stated previously. my carrier is Rogers and I previously used to receive LTE connection before rooting it. I went back to stock rom and re rooted my phone again because I had a GPS issue, but the GPS issue is fixed now but the LTE issue still remains. It shows 4G at all times EXCEPT when I make phone calls, it quickly changes to 3G(sometimes flickers back and forth from 3G/H/H+) and then when i'm off the phone, it will go back to 4G. I changed my Network Mode to LTE/GSM/WCDMA in regular Network settings screen(this sticks). Only thing that is not sticking is when I use the code *#*#4636#*#* and in there when I change it to LTE/GSM/WCDMA. It will change back to LTE/GSM auto (PRL) immediately. As few people mentioned that sometimes changing SIM cards work, but shouldn't my SIM card support LTE if I was getting LTE prior to rooting?

Can anyone help me, please!
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] mrnovanova:
I know there's a question in there somewhere...

Sent from my SAMSUNG-SGH-I747 using Xparent Cyan Tapatalk 2
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] DLogan24:
I didn't really understand..? I thought I provided enough information needed to maybe see if anyone can help me. If I didn't let me know, so I can provide it. Unless you're just here to be sarcastic.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] mrnovanova:
I'm not being sarcastic. You give out a ton of information but no actual question. Can you please formulate a clear question so we can figure out how to help you. :D

Sent from my SAMSUNG-SGH-I747 using Xparent Cyan Tapatalk 2

---------- Post added at 08:28 AM ---------- Previous post was at 08:24 AM ----------

If that is your question the answer is yes. I just assumed it wasn't because you wouldn't write all this for that question.
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] DLogan24:
Ahh..okay I see what you're saying. Sorry about the confusion, but I figured my question about SIM card supporting LTE would indicate my situation. Well yeah, I'm trying to regain my LTE connection that I originally was getting prior to rooting the phone and running CM10.1. I'm currently getting a 4G signal, but like I mentioned earlier, it tends to switch to 3G/H when I make a call and also when I'm in certain areas, it will just stick to 3G for some time. I've yet to see the "LTE" signal ever since running CM10.1 (nightlies).

Thanks for the replies!
[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] mrnovanova:
OK. Perfect. Now we're getting somewhere. The fact that your phone loses LTE while you making a phone call is perfectly normal. LTE or the version that we have so far is only for data not voice. Voice over LTE will probably be the next step. As far as not seeing LTE it's because on certain roms 4G is LTE. So when you see 4G go to settings /about phone /status. It should say LTE 14, hspa or umts. But since you have the right APN settings I'm pretty sure it'll say LTE. Let me know. Don't forget to hit thanks if I helped. ;)

Sent from my SAMSUNG-SGH-I747 using Xparent Cyan Tapatalk 2