Mobile Data keep switching off randomly - AT&T Samsung Galaxy Note 4

Just received SM-N910T from ebay and I am having problem with data as it keep switching off randomly. I am using mobile outside USA and everything works fine but time to time data keep turning off automatically.
Mobile data shows ON in the setting, I make on it comes on for a moment and gone again. After sometime start working for some time and OFF again.
Need your urgent support.
Thanks

uzairirl said:
Just received SM-N910T from ebay and I am having problem with data as it keep switching off randomly. I am using mobile outside USA and everything works fine but time to time data keep turning off automatically.
Mobile data shows ON in the setting, I make on it comes on for a moment and gone again. After sometime start working for some time and OFF again.
Need your urgent support.
Thanks
Click to expand...
Click to collapse
You post in wrong forum. This is Note 4 AT&T forum not T-mobile. SN-910 T is T-mobile , SN-910A is AT&T.
Clicking from far, far away in Galaxy 7 Edge

norbarb said:
You post in wrong forum. This is Note 4 AT&T forum not T-mobile. SN-910 T is T-mobile , SN-910A is AT&T.
Clicking from far, far away in Galaxy 7 Edge
Click to expand...
Click to collapse
Thanks I will post it there.

uzairirl said:
Just received SM-N910T from ebay and I am having problem with data as it keep switching off randomly. I am using mobile outside USA and everything works fine but time to time data keep turning off automatically.
Mobile data shows ON in the setting, I make on it comes on for a moment and gone again. After sometime start working for some time and OFF again.
Need your urgent support.
Thanks
Click to expand...
Click to collapse
Check apn setting and make sure it's right for your carrier.
Sent from my SAMSUNG-SM-N915A using XDA-Developers mobile app

Related

Network Connection Issue - No 3g/4g

OK, I have been dealing with this since I bought my GSII and cannot find any information about it.
Firstly I want to say that I am completely stock and unrooted.
My phone does not like to keep a stable data connection. About 50% of the time, when I try to do anything that requires a data connection (facebook, browser, gmail, etc.) the 2 arrows under the 2g/3g/4g icon will stick being grey and my phone just sits there "loading". I tried a factory reset, didn't install any apps, and also got a new sim card and the issue remains. It happens everywhere so it is not just a bad network connection.
I decided to post the question here because yesterday I was playing with my brother's GSII, and his did the same thing.. So it made me think that maybe it wasn't just me. Has anyone else experienced this? Or does anyone know what might be the cause?
Edit: I set my phone to use 2g only, and the problem vanished.. So it doesn't like to connect to 3g/4g.
Sent from my SGH-T989 using xda premium
Try going to your mobile network connection settings, choose access point names, hit your menu button and click "restore defaults".. It may fix it, I had data issues and it did the job. Hope it works for you!
Sent from my SGH-T989 using Tapatalk
Do what the gut above me said. Also call Tmobile and tell them, they will refresh your data connection on their end. That will clear up three problems your having.
But if it's also happening to your brothers phone, it's a network error. Call Tmobile.
Sent from my SGH-T989 using XDA App
munzik said:
Do what the gut above me said. Also call Tmobile and tell them, they will refresh your data connection on their end. That will clear up three problems your having.
But if it's also happening to your brothers phone, it's a network error. Call Tmobile.
Sent from my SGH-T989 using XDA App
Click to expand...
Click to collapse
I restored the apn settings and had Tmobile refresh my data connection, and it still happens. I noticed today that it's not just data, I'm also unable to call or text when it happens.. Tmobile just said everything tested normal so there is nothing they can do.. And I really don't think it's the phone so I don't want to exchange for a refurbished unless I have to.
Sent from my SGH-T989 using xda premiu
Its happened to me before. For about a week, the data connection just dropped. It would come back for a bit and later vanish. I called t-mobile and they guided me through routine steps (i.e. taking the battery out, rebooting, resetting) but nothing seemed to work. They really couldn't figure it out and later told me to replace the SIM. I can't remember if they shipped me one or had to go to the store but either way that relieved the problem. This was on an HTC HD2.
That might not be the case with you though. At one point in time all the phones under my name lost data connectivity just as you explain. This really had no solution but to wait it out.
Towle said:
I restored the apn settings and had Tmobile refresh my data connection, and it still happens. I noticed today that it's not just data, I'm also unable to call or text when it happens.. Tmobile just said everything tested normal so there is nothing they can do.. And I really don't think it's the phone so I don't want to exchange for a refurbished unless I have to.
Sent from my SGH-T989 using xda premiu
Click to expand...
Click to collapse
Are you paying for teathering?
sgip2000 said:
Are you paying for teathering?
Click to expand...
Click to collapse
No I don't use tethering, my download speeds are too slow where I live.
Sent from my SGH-T989 using xda premium
you mentioned your brother's is doing the same thing, its probably not the phone, but rather the cell tower your connected to is fuggin up. Try going 5 miles from where you currently are and see if its still happening.
Network error
Sent from my SGH-T989 using XDA App
Just in case it's not a cell tower or network problem . . . My SGS2, purchased in October, had the same symptoms as the OP. After trying everything the OP did, and more, I came to the conclusion that the firmware on the phone was corrupt. I used Odin to flash the factory stock ROM & Kernel images (2.3.5 at the time). There was a definite improvement in the faltering/hesitant/fail connectivity problem at that point, but it was still very subpar. So I then also flashed, again using Odin, the baseband ("modem") image - I did it twice for good measure. The problem was finally immediately solved at that point and I had very prompt loading of webpages, etc. Still working fine months later (and even better with a custom ROM). See the thread entitled "[Q]Is there a "true" factory restore for T-Mobile Galaxy S II?" for help about the seemingly same symptoms/problem you (and your brother) are experiencing. If your underlying problem is in fact the same as mine (and the poster of the thread I cited) then it's apparently either a bad factory flash or a post-factory corruption occurrence that is causing your problem . . . the coincidence of your brother also having the same problem aside. Good luck!
Sent from my SGH-T989 (now on GingerSnap v1.21) using XDA App

Data issues anyone?

for some reason i cant connect to my browser or anything using Data. i've flashed 3 different roms to see if i got the same results and still no data but everything else works fine Voice and Text.. and im in Orlando Fl. in case you guys were wondering
No Data
mackentosh said:
for some reason i cant connect to my browser or anything using Data. i've flashed 3 different roms to see if i got the same results and still no data but everything else works fine Voice and Text.. and im in Orlando Fl. in case you guys were wondering
Click to expand...
Click to collapse
I'm having the same issue, I didn't check this morning before I left Lakeland, but I'm near Lee and OBT and have no data on my Evo LTE. I am at least glad to see its not my ROM either.
:crying: im having the same issue. since i woke up about an hour ago ive noticed i have absolutely no data(west palm beach fl)... sprint has me on hold now
I spoke with Sprint and they said the network was down in Orlando and they are crediting my account for the down time.
Ok so it's not just me then but I'm calling to get my credit tho
Sent from my SPH-L710 using xda premium
I'm back online
Hearing stuff like this makes me wanna switch carriers.
Not sure if its just the carrier here. I've had this trouble on 2 different ROMs and the millisecond I wipe and re-flash I get data back. Some people have the same thing, others have not a clue in hell what were talking about.
Check your APN setting. Under setting- more setting- mobile network - APN.
What ROM are you on now?
If not call your carrier operator.
Sent from my GT-I9300 using xda app-developers app
amosljl1995 said:
Check your APN setting. Under setting- more setting- mobile network - APN.
What ROM are you on now?
If not call your carrier operator.
Sent from my GT-I9300 using xda app-developers app
Click to expand...
Click to collapse
I don't have that option, task&ktoonsez aokp jellybean. Had problems on cm10 nightlies and this. This ROM is epic awesome but I can't not have data. I had stock ROM rooted on stock lf9 radio, never un-rooted and updated. Not a single problem for months. Put cm10 on and within the first week, no data. Re flashed, still none. Flashed all 4 radio versions, then lost phone service. Flashed aokp last Monday, good until I woke up this morning. Went to bed last night with 20mbps 4glte connection, phone never moved, woke up with no data. I can get 3g once every 2 hours or so at a bandwidth of .6kbps ( speed test certified).
Try calling your network operator. Or you can reflash stock firmware and see if problem persist.
But CM10 by default has a wrong APN setting (For me) and I just change according to the right one and it is perfect now.
But reflash stock.one and try.
-If I did help, hit the thanks button
Sent from my GT-I9300 using xda app-developers app
amosljl1995 said:
Try calling your network operator. Or you can reflash stock firmware and see if problem persist.
But CM10 by default has a wrong APN setting (For me) and I just change according to the right one and it is perfect now.
But reflash stock.one and try.
-If I did help, hit the thanks button
Sent from my GT-I9300 using xda app-developers app
Click to expand...
Click to collapse
Called net op, reset connection with., otherwise... no help. Also I know nothing about apn's, however there was an APN update in the last change log. When I say I know nothing about apn's, that's literal. I don't even know what the acronym stands for.
sprint
pimpitout007 said:
I spoke with Sprint and they said the network was down in Orlando and they are crediting my account for the down time.
Click to expand...
Click to collapse
My friend is having a lot of issue with data in NJ with sprint. Maybe the they are testing LTE which is causing issues?
Data is back. titanium backup of user apps+data, backed up the built in launcher to SD, wiped, flash, gapps. Data working and phone is like I never left. Going to use all of the dev logging and track what I do day to day to see what the hold up is here.
No idea then....
Sent from my GT-I9300 using xda app-developers app
Call to action!
mackentosh said:
for some reason i cant connect to my browser or anything using Data. i've flashed 3 different roms to see if i got the same results and still no data but everything else works fine Voice and Text.. and im in Orlando Fl. in case you guys were wondering
Click to expand...
Click to collapse
TO ALL!!!! this is a call to action. I too, like many others are experiencing unacceptable data speeds while on 3G and in great reception while using the Galaxy S III. the speeds I should be receiving are 1.5-3 MB/s but instead I am receiving around 128Kb/s in the city and within excellent service. We all have to pay a 'Premium Data Add-On' charges just to own these phones and this is unacceptable. Please write an Email to [email protected], vice president of customer experience at sprint and let him know what you are experiencing. Maybe if enough pissed off customers write, they will finally listen!

[Help] No internet N7105

Hey everyone,I have an International N7105 on EE (UK)
Been running fine since I've had it and have been running some different roms.
Today I haven't been able to use mobile data, does anyone know of any problems with the network,or is it me?
I have signal, can make calls and send texts but no internet. Checked apn settings a million times and tried formatting and re-flashing my rom
The next step is reverting back to stock, but I was hoping there might be an easier solution.
Any help would be great,thanks
This may sound stupid but have u turned mobile data off? Have you run out of data from EE i dont know how it works when you hit your limit with them, my friend is on ee just checked his phone seems fine,
Sent from my GT-N7105 using Tapatalk 4 Beta
E_Goldstein said:
This may sound stupid but have u turned mobile data off? Have you run out of data from EE i dont know how it works when you hit your limit with them, my friend is on ee just checked his phone seems fine,
Sent from my GT-N7105 using Tapatalk 4 Beta
Click to expand...
Click to collapse
Got about 700mb left haha, data is enabled.
I've just flashed back to stock via odin so I'll see how it goes.
Zibbsy said:
Got about 700mb left haha, data is enabled.
I've just flashed back to stock via odin so I'll see how it goes.
Click to expand...
Click to collapse
from Twitter mate
EE ‏@EE 20m
Sorry about the intermittent problems with data on 4GEE today – we’re working hard to get superfast speeds back up for everyone right now
E_Goldstein said:
from Twitter mate
EE ‏@EE 20m
Sorry about the intermittent problems with data on 4GEE today – we’re working hard to get superfast speeds back up for everyone right now
Click to expand...
Click to collapse
what is my life :'(
at least I have my nandroid
That being said, I had no internet at all, not even 3g? hmmm
Zibbsy said:
Hey everyone,I have an International N7105 on EE (UK)
Been running fine since I've had it and have been running some different roms.
Today I haven't been able to use mobile data, does anyone know of any problems with the network,or is it me?
I have signal, can make calls and send texts but no internet. Checked apn settings a million times and tried formatting and re-flashing my rom
The next step is reverting back to stock, but I was hoping there might be an easier solution.
Any help would be great,thanks
Click to expand...
Click to collapse
in about device.does it say:baseband unknown?
If yes just flash modem zip
Go to google type ee internet setup and send yourself the internet settings I had this problem im in UK and I have to do it sometimes to get internet back hope this helps
Sent from my SAMSUNG-SG-N7105 lte using XDA Premium 4 mobile app

[DATA][FIX] Process com.android.phone FC Fix

Hey guys. I noticed a lot of people, including myself, have been getting the dreaded process com.android.phone force close message upon booting up new ROMs.
This only happens when trying to connect to data. Turn it off, and the force closes stop. Well, I believe I've found a workaround using an APN file I've found floating around on the Carbon ROM thread!
Upon booting, just keep clicking the OK message to skip past the FC errors and the ROM setup process, and then disable your data as soon as you can. Connect to wifi, go to the Play store and install your favorite root browser. Download the linked APN file at the bottom of this post to your phone, and open up your root browser. Copy the APN file you downloaded, then go to system/etc, delete the stock APN file and replace it with the new one. Set permissions to rw-r-r, reboot into recovery, and do a factory data reset. Boot back into ROM and voila, you should be good!
Note that this may or may not fix your data problems, as every phone is different and some of you are on different carriers. This method has been working for me ever since I started doing it a couple of days ago, and almost every new ROM I've installed recently have given me the FC error. That is no more with this new APN, and I even get a better data connection than before. Hope this helps you all!
Download link: http://www.mediafire.com/?8s937bc91ysgpqe
*****EDIT*****
This method has also fixed my data problems on the new KitKat ROMs as well. Before, I wouldn't even get data on the new KK ROMs, and if I did, 3G would go away and never come back when switching between wifi and data. Replaced the APN, and my data came back stable, even when switching to wifi.
Sent from my LG-LS970 using xda app-developers app
iamterence said:
Hey guys. I noticed a lot of people, including myself, have been getting the dreaded process com.android.phone force close message upon booting up new ROMs.
This only happens when trying to connect to data. Turn it off, and the force closes stop. Well, I believe I've found a workaround using an APN file I've found floating around on the Carbon ROM thread!
Upon booting, just keep clicking the OK message to skip past the FC errors and the ROM setup process, and then disable your data as soon as you can. Connect to wifi, go to the Play store and install your favorite root browser. Download the linked APN file at the bottom of this post to your phone, and open up your root browser. Copy the APN file you downloaded, then go to system/etc, delete the stock APN file and replace it with the new one. Set permissions to rw-r-r, reboot into recovery, and do a factory data reset. Boot back into ROM and voila, you should be good!
Note that this may or may not fix your data problems, as every phone is different and some of you are on different carriers. This method has been working for me ever since I started doing it a couple of days ago, and almost every new ROM I've installed recently have given me the FC error. That is no more with this new APN, and I even get a better data connection than before. Hope this helps you all!
Download link: http://www.mediafire.com/?8s937bc91ysgpqe
*****EDIT*****
This method has also fixed my data problems on the new KitKat ROMs as well. Before, I wouldn't even get data on the new KK ROMs, and if I did, 3G would go away and never come back when switching between wifi and data. Replaced the APN, and my data came back stable, even when switching to wifi.
Sent from my LG-LS970 using xda app-developers app
Click to expand...
Click to collapse
Thanks a Lot !!! Data worked for me on Omni rom !! :laugh:
Sweet! Thanks. Going to give this a shot now. Was so excited for 4.4 but it COMPLETELY disabled ALL my data (wifi/3G/LTE).
Guess it's time to give KitKat another shot.
Abhijeet357 said:
Thanks a Lot !!! Data worked for me on Omni rom !! :laugh:
Click to expand...
Click to collapse
no data "loss" for me on KitKat but 4G drops out when making a call and come right back after I hang up.
anyone else seeing this???
reddragon72 said:
no data "loss" for me on KitKat but 4G drops out when making a call and come right back after I hang up.
anyone else seeing this???
Click to expand...
Click to collapse
Okay, I've been seeing this complaint around the forums recently, so I'll say this.
For as long as I've ever owned a smartphone, 3G/4G ALWAYS turned off for me whenever I was in a phone call, but I could still browse the internet and stuff. Maybe now things are different with this phone/these ROMs, and data is actually blocked when in a call, I don't know. It's not an issue to me, though, because I really don't use data while in a call. So hopefully this issue can get cracked down further for you guys who do.
Sent from my LG-LS970 using XDA Premium 4 mobile app
iamterence said:
Okay, I've been seeing this complaint around the forums recently, so I'll say this.
For as long as I've ever owned a smartphone, 3G/4G ALWAYS turned off for me whenever I was in a phone call, but I could still browse the internet and stuff. Maybe now things are different with this phone/these ROMs, and data is actually blocked when in a call, I don't know. It's not an issue to me, though, because I really don't use data while in a call. So hopefully this issue can get cracked down further for you guys who do.
Sent from my LG-LS970 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I can confirm that no matter what ROM I've been on, when I made or received a call, my 4G/3G symbol would disappear, but if I was on 4G I could still access the internet. Not with 3G of course. I'll need to get to a 4G area and test this.
iamterence said:
Okay, I've been seeing this complaint around the forums recently, so I'll say this.
For as long as I've ever owned a smartphone, 3G/4G ALWAYS turned off for me whenever I was in a phone call, but I could still browse the internet and stuff. Maybe now things are different with this phone/these ROMs, and data is actually blocked when in a call, I don't know. It's not an issue to me, though, because I really don't use data while in a call. So hopefully this issue can get cracked down further for you guys who do.
Sent from my LG-LS970 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
For CM10.2 it works fine. For stock it is fine it just seems to be this KitKat that is a GSM build that is being worked over a bit for CDMA. That is where the problem lies.
Androidawg said:
I can confirm that no matter what ROM I've been on, when I made or received a call, my 4G/3G symbol would disappear, but if I was on 4G I could still access the internet. Not with 3G of course. I'll need to get to a 4G area and test this.
Click to expand...
Click to collapse
One stock my 4G symbol stays as well as internet. On KK I loose the symbol and no data connection. I always confirm that data is actually gone.
Not sure if you've all seen this but apparently it's going to be fixed soon.
http://forum.xda-developers.com/showthread.php?p=47449131
I tried this on liquid official..I DL APN deleted old one, set permission reboot to twrp wiped data and same thing...was wiping data the wrong thing? Can someone shed some light on this I'm not a noob but one to this phone
Sent from my LG-LS970 using Tapatalk
goast said:
I tried this on liquid official..I DL APN deleted old one, set permission reboot to twrp wiped data and same thing...was wiping data the wrong thing? Can someone shed some light on this I'm not a noob but one to this phone
Sent from my LG-LS970 using Tapatalk
Click to expand...
Click to collapse
Are you on Sprint?
Sent from my LG-LS970 using Tapatalk
iamterence said:
Are you on Sprint?
Sent from my LG-LS970 using Tapatalk
Click to expand...
Click to collapse
Yes
Sent from my LG-LS970 using Tapatalk
goast said:
Yes
Sent from my LG-LS970 using Tapatalk
Click to expand...
Click to collapse
Weird. This has worked for me on every AOSP ROM I've tried, including Liquid Did you paste it in system/etc?
Sent from my LG-LS970 using Tapatalk
Yeah going to try one more time but after I set permission what exactly do I do
Sent from my LG-LS970 using Tapatalk
goast said:
Yeah going to try one more time but after I set permission what exactly do I do
Sent from my LG-LS970 using Tapatalk
Click to expand...
Click to collapse
Paste in system/etc, set permissions to rw-r-r, reboot to recovery, factory data reset, reboot. Worked for me every time.
Sent from my LG-LS970 using Tapatalk
reddragon72 said:
no data "loss" for me on KitKat but 4G drops out when making a call and come right back after I hang up.
anyone else seeing this???
Click to expand...
Click to collapse
I wonder if this has to do with our builds coming from the nexus 5, since it is a tri-band LTE device. It does not have the capability to be connected to LTE and CDMA at the same time. Are there any radio files we are grabbing from the nexus 5 that might be causing this behavior to occur?
Check out this article, it talks about the inability of the tri band devices to be connected to LTE while using voice/text:
http://s4gru.com/index.php?/blog/1/...-due-to-circuit-switched-fallback-technology/
iamterence said:
Hey guys. I noticed a lot of people, including myself, have been getting the dreaded process com.android.phone force close message upon booting up new ROMs.
This only happens when trying to connect to data. Turn it off, and the force closes stop. Well, I believe I've found a workaround using an APN file I've found floating around on the Carbon ROM thread!
Upon booting, just keep clicking the OK message to skip past the FC errors and the ROM setup process, and then disable your data as soon as you can. Connect to wifi, go to the Play store and install your favorite root browser. Download the linked APN file at the bottom of this post to your phone, and open up your root browser. Copy the APN file you downloaded, then go to system/etc, delete the stock APN file and replace it with the new one. Set permissions to rw-r-r, reboot into recovery, and do a factory data reset. Boot back into ROM and voila, you should be good!
Note that this may or may not fix your data problems, as every phone is different and some of you are on different carriers. This method has been working for me ever since I started doing it a couple of days ago, and almost every new ROM I've installed recently have given me the FC error. That is no more with this new APN, and I even get a better data connection than before. Hope this helps you all!
Download link: http://www.mediafire.com/?8s937bc91ysgpqe
*****EDIT*****
This method has also fixed my data problems on the new KitKat ROMs as well. Before, I wouldn't even get data on the new KK ROMs, and if I did, 3G would go away and never come back when switching between wifi and data. Replaced the APN, and my data came back stable, even when switching to wifi.
Sent from my LG-LS970 using xda app-developers app
Click to expand...
Click to collapse
Sorry for belated update, worked like a charm for me.!
Confirmed to work. I did NO factory data reset or even rebooting. FCs just immediately stopped after replacing file. Proof enough for me.
What's the cause of this?
goast said:
Yeah going to try one more time but after I set permission what exactly do I do
Sent from my LG-LS970 using Tapatalk
Click to expand...
Click to collapse
This did not work for me on the AOSP 4.4 ROM either. I have tried several times and still get force closes. I am running fine on CM10.2 though.
Does this fix the issue with switching between 4G to 3G? While on the Omni rom, if I'm connected to 4G and it loses signal, it doesn't connect to 3G. Or, if I want to turn of 4G and only use 3G, it never connects.
For some reason, when I put it, the system just disregards it. It says successfully deleted and pasted too. When I delete the old one and paste the new one it says "Do you want to overwrite?" even though the old one is gone. Anybody got anything?
Sent from my LG-LS970 using xda app-developers app

data issues .

Any of u guys having issues where data just stops working and nothing would load? i have to toggle airplane mode work it to work again
Thank god
littlegreenalien said:
Any of u guys having issues where data just stops working and nothing would load? i have to toggle airplane mode work it to work again
Click to expand...
Click to collapse
I have the same issue, and this is one of the only posts about it. Have you found a way to fix it? I'm at a point where I'm about to just sell this. I can't get anything done. Do you by chance have T-Mobile?
Same issue. T-Mobile here. Doesn't disturb me enough to sell the phone, haven't had the issue since going to a custom ROM. I'm sure it'll be fixed with OTA's or whatever.
Hello
i have the same problem
i am on VIPNET Croatia
is some fix coming soon
it is very annoying
Really nice to know I'm not the only one. But my god, it's getting worse as time goes on. I'm at the point where I can't even get data unless I reboot the phone 5-6 times, and only for a few seconds. I am completely out of ideas.
Sent from my HTC One_M8 using XDA Free mobile app
CMP27240 said:
Really nice to know I'm not the only one. But my god, it's getting worse as time goes on. I'm at the point where I can't even get data unless I reboot the phone 5-6 times, and only for a few seconds. I am completely out of ideas.
Sent from my HTC One_M8 using XDA Free mobile app
Click to expand...
Click to collapse
is there any fix for this
my data mobile vorking about 3-4 minutes a then stop
then i must to setings to turn off and on mobile data
then is ok for some time
please help
Unfortunately, not that I have found. So, until we get someone to actually help, No.
CMP27240 said:
Unfortunately, not that I have found. So, until we get someone to actually help, No.
Click to expand...
Click to collapse
any help
i still have the issue
i don't want to sell the phone
but is very close
helpppp
SeanFloyd said:
Same issue. T-Mobile here. Doesn't disturb me enough to sell the phone, haven't had the issue since going to a custom ROM. I'm sure it'll be fixed with OTA's or whatever.
Click to expand...
Click to collapse
please can you tell me witch coustom rom did you put in htc M8
and solve the data issue
i am going crazy with this phone
and i want to put same coustom rom like you
to get problem fix
please help
I have been using my m8 since the day I got it back in early April and have never experienced that issue. I am also on tmo but have the dev edition with stock rom but I live in the city so I always get a strong and good signal.
Possible solution
My M8 worked great for a month when about a week ago I've started having serious issues with the HSPA data.
After working great for a few minutes the data stopped working.
The H icon showed that traffic was sent from the phone but no traffic received by the phone.
Sometimes the data connection was restored by itself and sometimes I has to toggle the data connection off/on to have it restored.
It both cases the data connection failed again after several minutes.
All the diagnostics app showen that there was hspa connection.
After trying almost anything I could think of I found out what causes my problem:
It's the F**** NFC!!!
I've forgot that a week ago I've disabled the NFC thinking this will save battery life (though the battery life is great).
Turning the NFC on (followed by a power-down/power up cycle) solved all the data connection problem.
I've verified several times that NFC disable is indeed the cause of my problem.
Hope this helps others on this thread.

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