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?
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It makes no sense!!
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Flash a different modem for signal issues.
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I've done that. No luck
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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.
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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.
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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.
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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.

Where did my 4G go!

I live in area that does not have 4 g so it stays off, however today at airport I tried and no 4G toggle anywhere! Where did it go, I swore when I got s3 I tested 4G but now it's gone? Thanks for help.
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BiggieD said:
I live in area that does not have 4 g so it stays off, however today at airport I tried and no 4G toggle anywhere! Where did it go, I swore when I got s3 I tested 4G but now it's gone? Thanks for help.
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
GS3 doent have a 4g "toggle" as you say...but you can make sure its enabled
settings-->more settings-->Mobile Network-->Network mode.
Preferred network mode should be set to "CDMA/LTE/EVDO"
If you have "CDMA/LTE/EVDO" enabled, anytime your in a Sprint LTE area your phone icon will switch from 3g to 4g.

n8te_1 said:
GS3 doent have a 4g "toggle" as you say...but you can make sure its enabled
settings-->more settings-->Mobile Network-->Network mode.
Preferred network mode should be set to "CDMA/LTE/EVDO"
If you have "CDMA/LTE/EVDO" enabled, anytime your in a Sprint LTE area your phone icon will switch from 3g to 4g.
Click to expand...
Click to collapse
doesn't it chew up more battery?

bigfamei said:
doesn't it chew up more battery?
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Click to collapse
it shouldnt chew up ure bttery at all, as all it does is search the network for 4gLTE and if it doesnt find it, it will automaticly go to sleep and try again like 2 or 3 hours later or periodically as it tells u. .however u do need to have sprint automatic connention left on in order for that work. atleast thats what i got from reading the sprint connection optimizer information it gave me.

Practitioner said:
it shouldnt chew up ure bttery at all, as all it does is search the network for 4gLTE and if it doesnt find it, it will automaticly go to sleep and try again like 2 or 3 hours later or periodically as it tells u. .however u do need to have sprint automatic connention left on in order for that work. atleast thats what i got from reading the sprint connection optimizer information it gave me.
Click to expand...
Click to collapse
The optimizer isn't for the LTE. I hate that garbage so I always leave it off. As long as your preferred network is set as stated above, it will automatically switch between them. Side note though, it may switch back to 3g if you don't have a very strong 4 g signal. It likes to be weird.
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Sounds like your thinking of a wimax phone. I I had a Motorola Photon and you had to physically turn 4g on and off on it.... I think most wimax 4g phones are that way.
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Do any of the custom ROMS have a toggle for 4g/3g? I live in a 4g area but sometimes the signal isn't strong enough so it goes to 3g. Quite annoying. It would be great to toggle 3g off and force 4g.

So I had s2 before s3, so I assume the s2 was a 4 -g wimax? It had a toggle widget.
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BiggieD said:
So I had s2 before s3, so I assume the s2 was a 4 -g wimax? It had a toggle widget.
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
Correct !:good:

sssqueue said:
Do any of the custom ROMS have a toggle for 4g/3g? I live in a 4g area but sometimes the signal isn't strong enough so it goes to 3g. Quite annoying. It would be great to toggle 3g off and force 4g.
Click to expand...
Click to collapse
Have you tried updating to the new radio? I believe they boosted the power to give slightly better LTE connectivity in those kinds of environments.

There is a way to force LTE on the GS3. I did it with mine so that I could map out the LTE zones with sensorly a bit easier while I was driving over the weekend. The way I was able to do this is you need to have Nova Launcher downloaded and installed.
Once you do this, long press on the home screen and go to "Shortcuts".
Next click on "Activities"
Next scroll down to "IOTHiddenMenu"
Then scroll down and click on "IOTHiddenMenu : HDR1X_Selection"
Doing this will allow you to force LTE only mode. Keep in mind you WILL NOT be able to make any phone calls while doing this. For some reason the GS3 requires the phone to be in LTE + CDMA + EVDO Mode to make calls even if you have a very strong LTE signal.
Another app I would recommend downloading is called OpenSignalMaps. Once you have the LTE only mode turned on or even the normal LTE + CDMA mode, you can use this app to refresh your network by clicking the little refresh button at the bottom left of the app in the Overview tab. What this does is pretty much turn your phones mobile networks on and off and then scan for LTE first before scanning for EVDO. I have been able to connect to many more LTE sites by doing this. Even ones that are fairly far away.
Hope this all helps. Let me know if you have any extra questions.

No data connection at all
I have the settings on GSM/HSPA/LTE, but lost data connection completely. Tried to restart and turned on/off flight mode - still no data. Voice in and out is OK. I finally managed to reconnect by repeating the process. Is there a better way to reconnect?
Thanks.

Check out "Network"
https://play.google.com/store/apps/details?id=de.mangelow.network
It takes you to the network screen as well
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with the latest l13 radio my phone will not stay on 4g it is heavily biased to 3g and I do not know how to fix it. I am right next to the 4g towers.. ... any thoughts? Thanks

Thanks
Thanks. Unfortunately, the "Network" app would not run. So I followed a similar line, and found "3G Reconnect". It does not fix the connection issue. Any other thoughts?

Turning on Mobile Data not Working

Hi all,
I keep my mobile data deactivated whenever I'm not using it, and coming from the S3 which made it very convenient to toggle the mobile data on and off, the Note 2 has been hugely inconvenient.
The problem is that when I manually turn mobile data back on in the Settings, mobile data just doesn't turn on. The only way to get it to reactivate is to cycle in and out of airplane mode once data's been activated.
Is this a problem for anyone else, and if not, anyone have any clue why this might be happening? I've got 2 Note 2s and it happens on both.
The only thing I've done to these phones is root and flash TWRP. They are the Ting variant of the Sprint Note 2 if that might make a difference.
Any help appreciated!

punitenshu said:
Hi all,
I keep my mobile data deactivated whenever I'm not using it, and coming from the S3 which made it very convenient to toggle the mobile data on and off, the Note 2 has been hugely inconvenient.
The problem is that when I manually turn mobile data back on in the Settings, mobile data just doesn't turn on. The only way to get it to reactivate is to cycle in and out of airplane mode once data's been activated.
Is this a problem for anyone else, and if not, anyone have any clue why this might be happening? I've got 2 Note 2s and it happens on both.
The only thing I've done to these phones is root and flash TWRP. They are the Ting variant of the Sprint Note 2 if that might make a difference.
Any help appreciated!
Click to expand...
Click to collapse
43 views and not one person can say if they have the same problem? /bump

Im coming from the S3 and I miss that mobile data toggle. Anyone find a rom that has it included?

Whompasaurus 2.9 Has it.
Bizdady said:
Im coming from the S3 and I miss that mobile data toggle. Anyone find a rom that has it included?
Click to expand...
Click to collapse
Whompasaurus (currently at version 2.9) has had for the last several updates I've tried. Most of the ROMS being updated support it.
http://forum.xda-developers.com/showthread.php?t=2039564

I have lte in my area and I just turned off mobike data and turned it back on and it came right back on. Ill try it whej im in 3g as well latwr today for u and post back.
Sent from my SPH-L900 using xda premium

It has happen to me only on a few time but not consistant enough for me to worry. I do the same as you and turn it on when needed.
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It happens occasionally with LTE but more so dropping to 3G and LTE not coming back untill I toggle Airplane Mode. I toggle my Data On/Off daily and never have an issue with it not coming back on. Then again I use the data toggle built into the 15 toggle mod.
LJC Deodexed - Themed
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Yes when im in a bad lte area it takes forever for my data to switch from 4g to 3g. Very annoying as my data doesnt work but I have the 4g icon up top.
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I also got this same problem with my Samsung Galaxy Grand Duos. I had no problem with Mobile Data for a few months...but after that.....When i trun ON Mobile Data..the icon which shows that it is connected.....does not appear....Just as the first post the only way i fixed mine was to check...then uncheck flight mode..Please help me

Loosing my modem/mind all together
I seem to keep loosing my modem on any version of jelly bomb (on the latest now 15.3) running Ma-7 currently but happens on any modem I try.
What is happening is data/call capability drops and does not come back until I re-flash a modem, and when I say drop, I mean totally dead not even able to make or receive phone calls.No 3G 4G and it shows signal bars but as soon as I hit the call button signal bars disappear.
I've tried re-flashing multiple times and still happens no matter where I am located, so I have a hard time believing it's a network problem like sprint keeps trying to tell me.(which they tell me there're working on)for like the last freggin year and a half.
I've flashed an asop rom and it seemed to be ok for the short while I tested it, but I like jelly bomb and would like to see if there is a fix for my problem and/or see if it is happening to anyone else.

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
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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.
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I haven't changed anything, but mine is already showing fast.T-Mobile.com, and that's the only option there.
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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!
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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!
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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
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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.

Showing wifi and 5G T-Mobile

I can't recall but is it normal to be showing my wifi and my cellular network? I can't upload any photos yet but upper right hand corner its showing both
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No that is not normal
Im in tmibile when im in 5g show 5g when i switch to wifi my 5g is gone. You only see wifi icon.
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sakooma said:
I can't recall but is it normal to be showing my wifi and my cellular network? I can't upload any photos yet but upper right hand corner its showing both
Sent from my SM-G988U using Tapatalk
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Click to collapse
Mine does this too. Probably just a glitch.

abine45 said:
Mine does this too. Probably just a glitch.
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Click to collapse
I sure hope so, I messaged the online help via text message from the T-Mobile app, and they said it's normal, but I don't think they understood what I meant..
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sakooma said:
I sure hope so, I messaged the online help via text message from the T-Mobile app, and they said it's normal, but I don't think they understood what I meant..
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Click to collapse
If you mean when WiFi is on your seeing the wifi bars and mobile bars at same time that is normal. Your only using your mobile data if you are seeing 5G or LTE showing next to the mobile bars.

Paul_Deemer said:
If you mean when WiFi is on your seeing the wifi bars and mobile bars at same time that is normal. Your only using your mobile data if you are seeing 5G or LTE showing next to the mobile bars.
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Click to collapse
I'm seeing the wifi icon AND the 5g icon then the mobile bars, is that normal?
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No in that case that wouldn't be normal. Only thing I can suggest is when your on WiFi turn off Mobile Data. I do that all time. No sense having both on when you only using one. You will still get texts and phone calls. You just won't get pics or videos through text until you turn mobile data on again.
So try that and see what happens when you turn mobile data off.

Paul_Deemer said:
No in that case that wouldn't be normal. Only thing I can suggest is when your on WiFi turn off Mobile Data. I do that all time. No sense having both on when you only using one. You will still get texts and phone calls. You just won't get pics or videos through text until you turn mobile data on again.
So try that and see what happens when you turn mobile data off.
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Click to collapse
So I spoke to t-mobile again, they said if im connected to now wifi it'll use wifi first, but it my wifi drops it just shows what connectivity I'll be using? Idk
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Mine used to do the same I had to uninstall visual voicemail. Not that it had any negative effect, I just didn't like both icons been displayed at once. I'm on Mint Mobile with an unlocked S20.

Usually when that happens is when you use an app that only uses data. Just like my Three app in the UK, doesn't use WiFi and you only can use it with data.
If you opened any sort of Tmobile app, force close it and put your phone into flight mode then turn flight mode off, or restart your phone.
It sometimes glitches out and doesn't go away, its really annoying.

This setting in developer options will cause this. Turn it off and your LTE/5G icon will go away when disconnected from wifi.

DarK_DemoN said:
This setting in developer options will cause this. Turn it off and your LTE/5G icon will go away when disconnected from wifi.
Click to expand...
Click to collapse
Now the 5G disappeared last night on its own, idk what could have been thev reasoning, oh well. I'll report back if it comes back on again
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