Develop Bugs

WiFi/data issues

How's it going everyone. Just left sprint for T-Mobile. Even with the problems I'm having its still better than sprint crappy network. Anyways. For some reason no matter what ROM I'm on I'm having issues where the WiFi will turn off it will go to 4g than WiFi will randomly turn back on. Or I'll have great service than randomly I'll see an E near my signal bars and it slows down for a good 5 minutes. Any idea what may be causing the problem?
Sent from my SGH-T999 using Tapatalk 2

It makes no sense!!
Sent from my SGH-T999 using Tapatalk 2

Flash a different modem for signal issues.
Sent from my SGH-T999

I've done that. No luck
Sent from my SGH-T999 using Tapatalk 2

In settings 》More settings
Make sure WiFi calling is disabled. Then go into Mobile Networks and change Network mode to WCDMA Only. See if that helps.
Sent from my SGH-T999 using xda app-developers app

Well if you are getting the E, that's Tmobile's network for ya. It is quite spotty. I get the same thing and goes back to 4G soon after. One of my main gripes with Tmobile.
If you do what DocHoliday said, it won't work at all. Just won't have any signal at all. If you leave it to auto, you will at least get the EDGE network.
Did this do the same thing with your old phone? If not, not sure what the deal would be besides weak radio maybe.

Try using the Llama app to force wifi on and disable the radios when around specific locations?
That's a workaround though...

JesseMT4G said:
Well if you are getting the E, that's Tmobile's network for ya. It is quite spotty. I get the same thing and goes back to 4G soon after. One of my main gripes with Tmobile.
If you do what DocHoliday said, it won't work at all. Just won't have any signal at all. If you leave it to auto, you will at least get the EDGE network.
Did this do the same thing with your old phone? If not, not sure what the deal would be besides weak radio maybe.
Click to expand...
Click to collapse
Its worth a shot. I had issues with staying on 4G when I first got the phone. That fixed it for me.
Spotty service depends upon your area imo. Sounds more like a network issue to me. Could be a side effect from all the refarming work they're doing on the network. Its a nationwide project so it can hapoen anywhere.
@op
If you turn off WiFi does it work as it should? If so check that WiFi calling isn't enabled and set to WiFi preferred. If it is turn it off and test, then if fixed turn it back on and try Cellular preferred.
Sent from my SGH-T999 using xda app-developers app

Dude I had that same issue until I flashed lh2 roms. Havent had that issue with lh2 roms at all.. try stocked up or wildchilds xquizit.
Sent from my SGH-T999 using Tapatalk 2

For what it's worth, I had this issue yesterday out of the blue. Nearly every time I would unlock my phone, wifi would be disconnected and I'd see the 4G icon. After unlocking the phone, a few seconds later it would connect up to wifi again. And yes, this is even with wifi set to always on in the advanced settings.
I realize there could be multiple causes for this symptom, but the fix for me was simply forget the wifi network and connect up to it again and the issue disappeared since then. Hasn't happened today yet either.

Odd data problem

Ok so I have an unlocked LG Nitro HD with custom ROM (CM10) and it has a very weird problem. I've tried two different AT&T MVNO SIM cards (AirVoice and Consumer Cellular) both have the same issue. My data signal keeps changing from H to H+ and occasionally to 3G like every few seconds regardless of where I am using the phone even outside. I don't understand what the problem is. What could be the issue?

screwregi said:
Ok so I have an unlocked LG Nitro HD with custom ROM (CM10) and it has a very weird problem. I've tried two different AT&T MVNO SIM cards (AirVoice and Consumer Cellular) both have the same issue. My data signal keeps changing from H to H+ and occasionally to 3G like every few seconds regardless of where I am using the phone even outside. I don't understand what the problem is. What could be the issue?
Click to expand...
Click to collapse
Are you able to use mobile data or are you just wondering why the icons go back and forth?

lordcheeto03 said:
Are you able to use mobile data or are you just wondering why the icons go back and forth?
Click to expand...
Click to collapse
Data does work but it seems to drain the battery with the networks constantly switching and on occasion I get a "No Connection" screen on certain apps, I guess because if I open an app while its swapping networks the app cant connect. It's strange.

screwregi said:
Data does work but it seems to drain the battery with the networks constantly switching and on occasion I get a "No Connection" screen on certain apps, I guess because if I open an app while its swapping networks the app cant connect. It's strange.
Click to expand...
Click to collapse
Yeah, constantly swapping networks will drain the battery.. what about your APN settings?

lordcheeto03 said:
Yeah, constantly swapping networks will drain the battery.. what about your APN settings?
Click to expand...
Click to collapse
They are set up properly.
I had another odd problem, just a few minutes ago was texting someone and all of a sudden phone froze while vibrating then restarted! Don't know if that's a bug in CM10 or what, maybe the network swapping is as well.

screwregi said:
They are set up properly.
I had another odd problem, just a few minutes ago was texting someone and all of a sudden phone froze while vibrating then restarted! Don't know if that's a bug in CM10 or what, maybe the network swapping is as well.
Click to expand...
Click to collapse
Maybe make a backup of your CM10 and try flashing a different ROM not based on CM10.

screwregi said:
They are set up properly.
I had another odd problem, just a few minutes ago was texting someone and all of a sudden phone froze while vibrating then restarted! Don't know if that's a bug in CM10 or what, maybe the network swapping is as well.
Click to expand...
Click to collapse
I think this is the same issue that I recently fixed in quattrimus. I will try to get the fix included in the cm kernel soon. You might try my Rom to see if the fix works.

lordcheeto03 said:
Maybe make a backup of your CM10 and try flashing a different ROM not based on CM10.
Click to expand...
Click to collapse
I tried installing CM9 and it appears to have fixed the problem, the phone doesn't try to connect to the H+ network anymore, only the H network and seems to stay on it so far. I did see it quickly go over to the 3G network but it doesn't appear to be causing any issues, it went right back to the H network. However, I really wish the CM10 ROM worked right, as CM9 is so old...

screwregi said:
I tried installing CM9 and it appears to have fixed the problem, the phone doesn't try to connect to the H+ network anymore, only the H network and seems to stay on it so far. I did see it quickly go over to the 3G network but it doesn't appear to be causing any issues, it went right back to the H network. However, I really wish the CM10 ROM worked right, as CM9 is so old...
Click to expand...
Click to collapse
CM10 is snappy and oh so buttery smooth, I give you that. On another note, did you try any other CM10 variants? I'd give tdmcode's AOKP a spin. He says he might have fixed that problem you were talking about in his build.

lordcheeto03 said:
CM10 is snappy and oh so buttery smooth, I give you that. On another note, did you try any other CM10 variants? I'd give tdmcode's AOKP a spin. He says he might have fixed that problem you were talking about in his build.
Click to expand...
Click to collapse
I downloaded the CM10 ROM. It seems to behave slightly differently. It stays on H normally, but when I start to do something with data, it will go to H+ until the data loads, then go back to H. So far no disconnects, I'll keep you posted. Right now I have very limited data, I'm switching to T-Mobile as soon as UPS decides to deliver my SIM card (just found out they have a 1900MHz HSPA+ network in my area!) I'll be able to test it better then, but for now I'm trying to stick to wifi, especially since I wasted so much data tonight playing around with this stuff, lol.

screwregi said:
It stays on H normally, but when I start to do something with data, it will go to H+ until the data loads, then go back to H.
Click to expand...
Click to collapse
This is how it's supposed to work.

drumist said:
This is how it's supposed to work.
Click to expand...
Click to collapse
Ditto... H and 3g are subsets of each other. Namely they can handle simultaneous voice and data 4G (h+) and lte can only handle data. So it switches back to H so you can receive and make calls plus it uses less battery. If you are on either 4G techs and receive a phone call while downloading it will automatically switch to H from h+ or lte, this is why. The only way you will never see this is on an AT&T rom where it only has 4G and lte icons.
Sent from my LG-P930 using xda app-developers app

Swetnes said:
Ditto... H and 3g are subsets of each other. Namely they can handle simultaneous voice and data 4G (h+) and lte can only handle data. So it switches back to H so you can receive and make calls plus it uses less battery. If you are on either 4G techs and receive a phone call while downloading it will automatically switch to H from h+ or lte, this is why. The only way you will never see this is on an AT&T rom where it only has 4G and lte icons.
Sent from my LG-P930 using xda app-developers app
Click to expand...
Click to collapse
I have LTE disabled, I'm not using the phone on AT&T.

Swetnes said:
Ditto... H and 3g are subsets of each other. Namely they can handle simultaneous voice and data 4G (h+) and lte can only handle data. So it switches back to H so you can receive and make calls plus it uses less battery. If you are on either 4G techs and receive a phone call while downloading it will automatically switch to H from h+ or lte, this is why. The only way you will never see this is on an AT&T rom where it only has 4G and lte icons.
Sent from my LG-P930 using xda app-developers app
Click to expand...
Click to collapse
H+ isn't a subset of 4G is it? I know that the CM's have separate icons for 3G/H, H+, 4G, and LTE.

lordcheeto03 said:
H+ isn't a subset of 4G is it? I know that the CM's have separate icons for 3G/H, H+, 4G, and LTE.
Click to expand...
Click to collapse
That certainly is debatable but the US's largest carrier considers it to be, it behaves like 4g, H+ may not be as fast but it is 90%+ as fast in most markets small enough to not make a noticeable difference as far as people's perception and the technology behaves like LTE in a lot of respects, CM is international so it just conforms to International norms so that's why you get H+ AND 4G (LTE) designators.
Sent from my LG-P930 using xda app-developers app

Fixed service dropping and locked LTE

I finally got LTE locked on with Telus other users confirmed Rogers, AT&T and Bell(thanks) . No service disconnections, even while on wifi.
The problem I see is conflicting settings while flashing roms/modems. This seems to be the only fix. I'm pretty stoked I figured this out because I was about to switch back to my s2x out of frustration.
This took a lot of trial and error, literally had nothing to go on and no where in particular to start. Enjoy.
MAKE SURE YOU ENABLE LTE TOGGLE IN ROM AND HAVE IT ON BEFORE STARTING.
1. Network mode(settings/wireless & networks, more/ mobile networks/ network mode) set to gsm/lte/wcdma
2.Phone setting in test mode *#*#4636#*#* set to lte/gsm
at&t / rogers should select gsm/lte/cdma in test mode
3.Recovery flash latest modem mumLL1
(at&t users flash ucdlk3)
Wipe cache/dalvik
4 . Reset. Give it a couple mins to ask the network for lte.
If you disable Lte(through toggle) and want to use 3g/H+ for battery saving, the only way I've been able to reconnect to it; is to re enable(toggle) and reset, wait a couple mins to connect.
Side note: depending on your 4g service area, it may bounce around 3g/H+ which is normal.
When you place a call it will drop to 3g (the believed reason for this is that the phone knows you won't need heavy data so falls back to ease up on the battery during calls) but will reconnect a couple mins later. Our phones are slow to negotiate Lte connections with the radio testing sockets and network stability before committing, so be patient.
Let me know if this works for you and which network. Thanks.
Modems can be found here
http://forum.xda-developers.com/showthread.php?p=34397816

Re: Fixed service droping and locked LTE
To check if it worked. Go into test mode and it should say Lte in network type.
Xda I747

So does this mean we get no 3g?
Sent from my Mind using Telekinesis!

Yes everything works. I can unselect lte in my toggles and it drops to 3g/hspa. When I re-enabled lte I noticed that I have to make sure in network settings lte/gsm/wdcma is selected and reset phone.
Xda I747

O wow lucky u I can't unselect on Att lol
Sent from my Mind using Telekinesis!

Which rom are you on? Should be up in your toggles. Basically it changes you network settings from cdma/gsm to lte/gsm/cdma. But it conflicts sometimes.
Xda I747

Its there it just doesn't do anything because all the modems on the Att S3 are Rill locked or something so we don't have the option to do it so easily
Sent from my Mind using Telekinesis!

dark_intel you are the man, i finally have 4G

btw works on at&t

countrylife said:
btw works on at&t
Click to expand...
Click to collapse
Just make sure you help spread this thread like a bad STD, this is a huge problem affecting many!

Worked for me on Bell Mobility.
Edit: Running CM10.1 (latest nightly)

No Test Mode using CM10.1 ROM
dark_intel said:
I finally got LTE locked on with Telus other users confirmed Rogers, AT&T and Bell(thanks) . No service disconnections, even while on wifi.
The problem I see is conflicting settings while flashing roms/modems. This seems to be the only fix. I'm pretty stoked I figured this out because I was about to switch back to my s2x out of frustration.
This took a lot of trial and error, literally had nothing to go on and no where in particular to start. Enjoy.
MAKE SURE YOU ENABLE LTE TOGGLE IN ROM AND HAVE IT ON BEFORE STARTING.
1. Network mode(settings/wireless & networks, more/ mobile networks/ network mode) set to gsm/lte/wcdma
2.Phone setting in test mode *#*#4636#*#* set to lte/gsm
at&t / rogers should select gsm/lte/cdma in test mode
3.Recovery flash latest modem mumLL1
(at&t users flash ucdlk3)
Wipe cache/dalvik
4 . Reset. Give it a couple mins to ask the network for lte.
If you disable Lte(through toggle) and want to use 3g/H+ for battery saving, the only way I've been able to reconnect to it; is to re enable(toggle) and reset, wait a couple mins to connect.
Side note: depending on your 4g service area, it may bounce around 3g/H+ which is normal.
When you place a call it will drop to 3g (the believed reason for this is that the phone knows you won't need heavy data so falls back to ease up on the battery during calls) but will reconnect a couple mins later. Our phones are slow to negotiate Lte connections with the radio testing sockets and network stability before committing, so be patient.
Let me know if this works for you and which network. Thanks.
Modems can be found here
http://forum.xda-developers.com/showthread.php?p=34397816
Click to expand...
Click to collapse
Ok sounds promising but unable to get my ATT phone running ROM cyanogenmod10.1 03/04 nightly into Test Mode using the keypad code provided. This does work for stock ROM phones. Do you know any other way to get into the test mode?

Haven't tried stock. Im on cm10..
Xda I747

I'm on CM10.1 not stock.
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Yeah I'm pretty sure everyone is using cm10 or aokp. Not sure if stock is having these problems. If they were I'd be on the phone yelling at Telus.
Xda I747

So let me get this right. This fixes the signal jumping around on cm10/aokp ROMs?? That's the only reason I stay on a stock based rom. I'm tired of seeing my signal jump back and fourth from 4g to 3g etc. On stock I always have a rock solid signal. It does not jump around..... Thanks in advance...
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Yes for me and others didn't even get 4g, also it would completely go out of service. Now I get steady 4g.
Xda I747

Any alternative way to get into "test mode" other than using the keypad?
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

Sorry man, I tried looking around for a way. Could be the rom you're on. I know Liquid and Carbon are fine. Probably a couple more that I don't even know of, others have success with.
Xda I747

rpomponio said:
So let me get this right. This fixes the signal jumping around on cm10/aokp ROMs?? That's the only reason I stay on a stock based rom. I'm tired of seeing my signal jump back and fourth from 4g to 3g etc. On stock I always have a rock solid signal. It does not jump around..... Thanks in advance...
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
Click to expand...
Click to collapse
stock lies to and shows 4G all the time, cm10 and show the truth. the s3 sets at 3g until data is needed then transfers to 4g

LTE Connection Possible Fix

I have noticed that there are people starting to notice that that have LTE in their frequenting areas, but it's messing with their data once they leave these areas.
For me it was having issues kicking back to edge and even 4G signals would not pull any data, would simply say that I had no connection. Didn't matter whether rooted or not or which rom I was using.
Anyway,
I have discovered somewhat a fix for this issue.
Under Connections tab in Settings, click more networks, then mobile networks, then Access Point Names my Access Point Name was epc.tmobile.com.
I noticed in other forums their APN should be fast.t-mobile.com so I thought I'd give it a try and incredibly my results were pretty good. It goes in and out of LTE areas pretty smoothly in comparison to losing data altogether.
Give it a try and report back.
Thanks

I was experiencing drop of data connection for long period of time (at least 5-10 mins) every time I leave the house, losing my wifi connection. More than once it just won't connect at all for a good couple of hours. I just did a test today, messing with the APN, network operator settings and get it to connect to 4gLTE. Once and turn on and then off the wifi, I lose the data again. And it wasn't gonna come back.
The fast.t-mobile.com address seems to do the trick and I'm now immediately on 4gLTE after losing wifi. and the speed is AMAZING at 24,000kbps download and over 10,000kbps upload.
Thanks!!!

I already had that APN setting but I wasn't getting ant 4G LTE :/ must not be in my area yet. I'm in north Georgia
Sent from my SGH-M919 using xda app-developers app

With thr default (epc..) APN, I had LTE before in NYC, DC, Boston. It just happened that the connection drop was getting more and more noticeable so I had to do something about it.
Sent from my SGH-M919 using xda app-developers app

I haven't changed anything, but mine is already showing fast.T-Mobile.com, and that's the only option there.
Sent from my SGH-M919 using Tapatalk 2

great find, I must have switched between 5-7 different roms trying to figure out why I'd lose data for up to 20min. after coming off wifi. Once I got reconnected to 4g I was afraid to even turn my wifi back on.

This seems to me to have just started recently, I'll have 4G but I might use the elevator at work and lose my connection, upon being back in service I'll be stuck on Edge for about 10-20 minutes before it picks up the 4G connection again.
I've been switching to Airplane Mode then back and that seemed to help but it doesn't any longer.
My APN is already fast.t-mobile.com, is there any other solution to fixing this?
EDIT: If I reboot my phone it connects to 4G immediately, and I'm using a Rooted Stock MDL Build w/ the Faux kernel.
Thank you!

MMakoto said:
I haven't changed anything, but mine is already showing fast.T-Mobile.com, and that's the only option there.
I have noticed before as well that roms default fast.t-mobile.com, but other times it would not. I could still get LTE with the epc..... but it wouldn't hold it.
Sent from my SGH-M919 using Tapatalk 2
Click to expand...
Click to collapse
Saintfyre said:
This seems to me to have just started recently, I'll have 4G but I might use the elevator at work and lose my connection, upon being back in service I'll be stuck on Edge for about 10-20 minutes before it picks up the 4G connection again.
I've been switching to Airplane Mode then back and that seemed to help but it doesn't any longer.
My APN is already fast.t-mobile.com, is there any other solution to fixing this?
EDIT: If I reboot my phone it connects to 4G immediately, and I'm using a Rooted Stock MDL Build w/ the Faux kernel.
Thank you!
Click to expand...
Click to collapse
Unfortunately I do not know of any other things that might help with LTE connection. I just stumbled on this and thought I'd share what worked for me.

Can anyone with fast.tmo take screenshots of their settings for that apn. My Rom doesn't have that and I would like to manually add it in. Thanks!
Sent from my SGH-M919 using xda app-developers app

Closed Source Project said:
Can anyone with fast.tmo take screenshots of their settings for that apn. My Rom doesn't have that and I would like to manually add it in. Thanks!
Sent from my SGH-M919 using xda app-developers app
Click to expand...
Click to collapse
Sent from my SGH-M919 using xda app-developers app

What baseband are you guys on cause I dont have these issues on mdb baseband

hey I just want to say thanks man for discovering this.... it was a big help... I sent you a private message pretty much saying the same thing but figured I'd drop a comment on the thread too.... appreciate it
Sent from my SGH-M919 using xda premium

cwalker0906 said:
What baseband are you guys on cause I dont have these issues on mdb baseband
Click to expand...
Click to collapse
I'm on the MDL baseband.
I'm looking is there a way to flash the MDB baseband?

Once and turn on and then off the wifi, I lose the data again. And it wasn't gonna come back.
The fast.t-mobile.com address seems to do the trick and I'm now immediately on 4gLTE after losing wifi. and the speed is AMAZING at 24,000kbps download and over 10,000kbps upload.

No LTE after rom install

I have a S3 i747 and have tried several different roms and always lose my LTE. After install it jumps back and forth between H+ and 3g it never stays on one. I have tried installing LTE fix and it does not fix problem. I also tried manually entering correct ATT setting but still nothing. I tried speedtest after to see what my speeds where and H+ is around 3mb download and 3g is around 500kb download. please can anyone help

khoury1 said:
I have a S3 i747 and have tried several different roms and always lose my LTE. After install it jumps back and forth between H+ and 3g it never stays on one. I have tried installing LTE fix and it does not fix problem. I also tried manually entering correct ATT setting but still nothing. I tried speedtest after to see what my speeds where and H+ is around 3mb download and 3g is around 500kb download. please can anyone help
Click to expand...
Click to collapse
Try this
http://forum.xda-developers.com/showthread.php?t=1947376

khoury1 said:
I have a S3 i747 and have tried several different roms and always lose my LTE. After install it jumps back and forth between H+ and 3g it never stays on one. I have tried installing LTE fix and it does not fix problem. I also tried manually entering correct ATT setting but still nothing. I tried speedtest after to see what my speeds where and H+ is around 3mb download and 3g is around 500kb download. please can anyone help
Click to expand...
Click to collapse
Do you still have your imei? That's located under settings, about phone, and phone status.
Sent from my SGH-I747 using Tapatalk 4 Beta

Yes it's to still there. I entered the correct settings from above post. And it still jumps from H+ to 3G
Sent from my SGH-I747 using xda premium

If that didn't fix try this
http://forum.xda-developers.com/showthread.php?t=1947376&page=27 Post: 263
mrnovanova said:
Yeah that happens when going back to a tw rom from an aokp. What you have to do is backup your current rom, restore a backup of your stock rom once you're in there go to more settings you should find the option for lte in there choose it wait for it to connect and once you're connected just restore you're rom and you should have lte.
Sent from my SAMSUNG-SGH-I747 using Xparent Cyan Tapatalk 2
Click to expand...
Click to collapse

khoury1 said:
I have a S3 i747 and have tried several different roms and always lose my LTE. After install it jumps back and forth between H+ and 3g it never stays on one. I have tried installing LTE fix and it does not fix problem. I also tried manually entering correct ATT setting but still nothing. I tried speedtest after to see what my speeds where and H+ is around 3mb download and 3g is around 500kb download. please can anyone help
Click to expand...
Click to collapse
Ok I can help you fix this no problem. First things first, do you have nandroid backup of your stock rom? You know that's the first thing to do before you flash right?
Carried by a Raven

Yes I have back up. I just restore phone and reinstalled rom still the same issue. Now H+ download speed .22mb

Can anyone help with this. I really want to try new Roms but don't want to lose 4g or LTE
Sent from my SAMSUNG-SGH-I747 using xda premium

This is slightly different than the guide posted above and has worked for me every time.
Go into your phone dialer. Enter *#*#4636#*#*. Go to phone information, and find the drop down menu. Select "LTE only". This should force LTE. Then you can select LTE/... Whatever one you want, and it should start connecting to LTE by default. If it didn't work, then LTE is unavailable to your phone for whatever reason.
Sent from my SGH-I747 using xda app-developers app

So if i am not in a LTE area will i still have 4g cause right now it bounces between H+ and 3g. it does not hold H+ very long then goes to 3g for few minutes then back and forth and download speeds are crap. I was getting .22MB.
Lumixz said:
This is slightly different than the guide posted above and has worked for me every time.
Go into your phone dialer. Enter *#*#4636#*#*. Go to phone information, and find the drop down menu. Select "LTE only". This should force LTE. Then you can select LTE/... Whatever one you want, and it should start connecting to LTE by default. If it didn't work, then LTE is unavailable to your phone for whatever reason.
Sent from my SGH-I747 using xda app-developers app
Click to expand...
Click to collapse

I tried to dail *#*#4636#*#* after rom install but nothing happens

khoury1 said:
So if i am not in a LTE area will i still have 4g cause right now it bounces between H+ and 3g. it does not hold H+ very long then goes to 3g for few minutes then back and forth and download speeds are crap. I was getting .22MB.
Click to expand...
Click to collapse
If you are not in an LTE zone, you cannot connect to it. If your phone says "4G", it is referring to LTE. "H+" refers to HSPA+ which is more accurately 3.5G. If your phone is switching between H+ and 3G, it may just be corresponding with your data activity, where H+ is active and 3G is inactive. It may also be because of poor connection, which could too be why you're getting bad download speeds.
khoury1 said:
I tried to dail *#*#4636#*#* after rom install but nothing happens
Click to expand...
Click to collapse
That's strange. Try downloading this app.
https://play.google.com/store/apps/details?id=net.andirc.lteonfoff