Develop Bugs

droppping from 3g to 1x

for some reason after i flash a rom i will only get 1x and i have to go back to a stock rom to get 3g back. has anyone else had this problem?

Check your prls and modems
Sent from my SPH-L710 using xda premium

i have updated the prls and i was on the latest modem and it was still doing it. then i tried downgrading to LF9 modem with no change. im on the LG2 build.

Which ROM? On Cm10 early builds I only showed 1x but if doing speed tests and looking at dbm signal output I was still getting 3g speeds.

i first tried it on blazer ROM 1.5 then i seen there was an update so i tried 1.6 but got the same thing

i have also just tried it with Team VeNuM's blue themed rom and i have the same outcome

What kind of real speeds are you getting when you speed test? It's entirely possible that you truly only have 1x speeds in your area. Sprint has "strongly encouraged" Samsung and HTC to always show 3G in areas where there is supposedly 3G. Most custom ROMs have corrected this by showing actual speeds in their ROMs. So it could also be that you truly are only getting 1x and the stock ROM is falsely reporting 3G.

ok well now that im home (i was away on vacation in the Poconos) i ran a speed test and got decent numbers this is the results of 3 tests i ran /ping- 92, 77, 76 /download kB/s- 214.6, 236.8, 152.5 /upload kB/s- 78.3, 77.8, 101.6. so i backed up, flashed Team VeNuM's rom and wiped cache but when the phone booted it showed 3g so maybe b/c i was in PA it might have been saying i was in 3g when i really wasnt proving what you were saying jdogg836. so heres the results of the speed test /ping- 121, 134, 206 /download kB/s- 89.1, 67, 64.4 /upload kB/s- 61.1, 28, 58.6 it's showing much slower speeds but im not sure why

makipsee said:
ok well now that im home (i was away on vacation in the Poconos) i ran a speed test and got decent numbers this is the results of 3 tests i ran /ping- 92, 77, 76 /download kB/s- 214.6, 236.8, 152.5 /upload kB/s- 78.3, 77.8, 101.6. so i backed up, flashed Team VeNuM's rom and wiped cache but when the phone booted it showed 3g so maybe b/c i was in PA it might have been saying i was in 3g when i really wasnt proving what you were saying jdogg836. so heres the results of the speed test /ping- 121, 134, 206 /download kB/s- 89.1, 67, 64.4 /upload kB/s- 61.1, 28, 58.6 it's showing much slower speeds but im not sure why
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Call sprint...lots of antennas are only around 60-70% right now....got to do with upgrading system from my understanding...also...upgrade your radio to LG8 and see what happens. :fingers-crossed:

but that big of a drop within minutes? yea im on the LF9 modem i downgraded from the LG2. are people having better luck with the LG8 from the LG2?

makipsee said:
for some reason after i flash a rom i will only get 1x and i have to go back to a stock rom to get 3g back. has anyone else had this problem?
Click to expand...
Click to collapse
Check to see if the time you flashed has the 1x/3g mod... stock Roms only ever show 3g even when they are on 1x..
You can also go into the market and download netmonitor which will tell you your true network type.
I'm almost willing to bet that's the problem.
I too live in pa and most northern parts only have 1x service.. just so you know.
Harrisburg/reading/Lebanon is where you start getting 3g.
Edit. Most of what I said was already explained. Didn't see jdoggs post.
Sent from my SPH-L710 using xda premium

makipsee said:
for some reason after i flash a rom i will only get 1x and i have to go back to a stock rom to get 3g back. has anyone else had this problem?
Click to expand...
Click to collapse
Personally I've has this problem since day 1 with this phone. On Airave it seems worse than being connected to towers for me. Sometimes mine goes from 3g to 1x to no data. Turning mobile data off and on usually fixes the issue. I've tried all radios, no difference, LG8 seems to keep connection longer.

joeyhdownsouth said:
Personally I've has this problem since day 1 with this phone. On Airave it seems worse than being connected to towers for me. Sometimes mine goes from 3g to 1x to no data. Turning mobile data off and on usually fixes the issue. I've tried all radios, no difference, LG8 seems to keep connection longer.
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If you have the original airave it only has 1x.
The newer version the airvana has 3g coverage..
Sent from my SPH-L710 using xda premium

dtr145r said:
If you have the original airave it only has 1x.
The newer version the airvana has 3g coverage..
Sent from my SPH-L710 using xda premium
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I've had newer one since the day it came out, no problems with any other phone I've had, just s3. I believe the problem to be the phone, sprint, or my isp.
this message brought to you by my GalaxyS3

I have had modem issues since day one too, I got a new phone because of the poor signal and it's the same.
I tried all the radios this weekend and found no real gains with any. I saw the 1x indicator with the CM10 7/29 build and the AOKP ROM.
Stock based ROM all showed 3G, but it would make sense if they are lying, although I would see 1x in distant lands on my EVO.
I will try the speed test.
It's also worth noting that I have a friend with a stock HTC X one getting about the same signal as me, so it may well be that sprint is messed up here.

lost+found said:
I have had modem issues since day one too, I got a new phone because of the poor signal and it's the same.
I tried all the radios this weekend and found no real gains with any. I saw the 1x indicator with the CM10 7/29 build and the AOKP ROM.
Stock based ROM all showed 3G, but it would make sense if they are lying, although I would see 1x in distant lands on my EVO.
I will try the speed test.
It's also worth noting that I have a friend with a stock HTC X one getting about the same signal as me, so it may well be that sprint is messed up here.
Click to expand...
Click to collapse
I'm not sure at this point, tried everything under the sun, just today I got into the Airvana management page and set it to my router's reserved IP for my Airvana. I think its Sprint also, but you know when I'm right under the Airvana, it seems my s3 keeps solid data connection. This could very well be a weak radio in the S3. All I know is I never had this issue with any previous phones. Maybe 1 day someone will figure this out as Sprint Airave techs are worthless, I feel like I know more than they do!

My problem is even worse since I rooted and flashed AOKP. Hopefully someone can help here. I can make phone calls, it shows 1x, but I don't have a data connection...
Wondering if it is my area. I haven't had issues before. Maybe I should call Sprint to see if they are messing with the towers.
UPDATE: Fixed by flashing stock rom and using the ##72786# in the phone keypad thankfully.

colddonkey said:
My problem is even worse since I rooted and flashed AOKP. Hopefully someone can help here. I can make phone calls, it shows 1x, but I don't have a data connection...
Wondering if it is my area. I haven't had issues before. Maybe I should call Sprint to see if they are messing with the towers.
Click to expand...
Click to collapse
Yuuup.. They are dicking around constantly.
Sent from my SPH-L710 using xda premium

[Q] LG8 Connectivity Issues?

Some basic info: Sprint SGS3; rooted, manually updated to LG8. Otherwise, stock.
Since then, I've noticed that my phone doesn't "hold on" to 4G as well as it did pre root and update. For example, the 4G icon will be next to the signal strength in my status bar then it will disappear, there will just be signal strength with no connection indicator then either 3G or 4G will appear. I don't ever remember this happening before root/update. I haven't flashed anything else on the phone, and the main reason I rooted in the first place was so I could easily tether.
Has anyone else had this same issue?

Its funny that the LG8 update was supposed to help users that were having LTE connectivity issues... this happens to me on occasion too. i would venture to say that a combination of LTE still being in early development and coverage being spotty at times even in areas where u may have gotten full coverage at one point plus the "Connection Optimizer" that often jacks with ur data connection switching between wifi, 3g and 4g(LTE)... try doing a ##72786# to reactivate ur phone on the network... this will automatically re-associate ur data profile with the network and update prl info as well...

+1 I have the same issue
Sent from my SPH-L710 using xda premium

I am envious that you have a LTE signal to lose, I've not tasted any LTE yet 3 weeks after go live of LTE in the Atlanta area

Visionikz03 said:
Its funny that the LG8 update was supposed to help users that were having LTE connectivity issues... this happens to me on occasion too. i would venture to say that a combination of LTE still being in early development and coverage being spotty at times even in areas where u may have gotten full coverage at one point plus the "Connection Optimizer" that often jacks with ur data connection switching between wifi, 3g and 4g(LTE)... try doing a ##72786# to reactivate ur phone on the network... this will automatically re-associate ur data profile with the network and update prl info as well...
Click to expand...
Click to collapse
Thanks for the reply. I'll try the ##72786# and report back with results.
You make a fair point about LTE still getting off the ground, but I will say that pre-root/update, my phone held 4G consistently. Whatever the issue is, hopefully it will sort itself out soon, or enough people will have the same issue that it spurs some action on Sprint's side.
I'm in Houston, FWIW.
Edit/Update: ##72786# seemed to do the trick. HOWEVER, about 15 minutes ago, I attempted to turn on WiFi Tether. My laptop connected with no issues, but about 5 minutes into it, neither the 4G nor the 3G icons appeared next to the signal strength meter. ##72786#'d again, just to see if it made a difference, updated PRL and Profile. Things are holding steady so far, but we'll see how long this lasts.
I'll try to update later in the day.

kindalikemike said:
Thanks for the reply. I'll try the ##72786# and report back with results.
You make a fair point about LTE still getting off the ground, but I will say that pre-root/update, my phone held 4G consistently. Whatever the issue is, hopefully it will sort itself out soon, or enough people will have the same issue that it spurs some action on Sprint's side.
I'm in Houston, FWIW.
Edit/Update: ##72786# seemed to do the trick. HOWEVER, about 15 minutes ago, I attempted to turn on WiFi Tether. My laptop connected with no issues, but about 5 minutes into it, neither the 4G nor the 3G icons appeared next to the signal strength meter. ##72786#'d again, just to see if it made a difference, updated PRL and Profile. Things are holding steady so far, but we'll see how long this lasts.
I'll try to update later in the day.
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Glad to see it worked. This is by no means a permanent fix. As u flash different roms thru out ur phones life span its a good idea to run this code every so often as flashing can overtime degrade baseband performance as those files dont get replaced with a rom but different roms interact with those files depending on the tweaks made at software level...
Sent from my SPH-L710 using xda premium

jdelano said:
I am envious that you have a LTE signal to lose, I've not tasted any LTE yet 3 weeks after go live of LTE in the Atlanta area
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I can't wait either. For those that have 4G i'm curious as to what the battery life is like and how much faster the network is on the SG3.

Visionikz03 said:
Glad to see it worked. This is by no means a permanent fix. As u flash different roms thru out ur phones life span its a good idea to run this code every so often as flashing can overtime degrade baseband performance as those files dont get replaced with a rom but different roms interact with those files depending on the tweaks made at software level...
Sent from my SPH-L710 using xda premium
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The issues cropped up again throughout the day, though not as frequently. I made a post in a reddit subforum and someone there suggested I flash new radios. Any idea on whether that would work, and if so, where/how/what?

kindalikemike said:
The issues cropped up again throughout the day, though not as frequently. I made a post in a reddit subforum and someone there suggested I flash new radios. Any idea on whether that would work, and if so, where/how/what?
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Click to collapse
I tried to flash the LG2 radio and it made no difference at all.

mrg02d said:
I tried to flash the LG2 radio and it made no difference at all.
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It won't, till Sprint gets their network done. I've been back and forth on all radios, no difference IMO.
this message brought to you by my GalaxyS3 running Phantom's Blazer v1.6

Try this... http://forum.xda-developers.com/showthread.php?t=1816530
Sent from my SPH-L710 using xda premium

That is dissapointing
jdelano said:
I am envious that you have a LTE signal to lose, I've not tasted any LTE yet 3 weeks after go live of LTE in the Atlanta area
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Click to collapse
I am up here in Sugar Hill. Sprint Map shows you deep in LTEville. I worked in Tucker last year when a co-worker got a Verizon Tunderbolt. His 4G was screaming. He was getting 40+ down!
But the map also shows Cumming in LTE land so I drove over there just to see what LTE looked like and I saw the icon flicker on for about 30 sec. but it never really was there.

Naddict said:
Try this... http://forum.xda-developers.com/showthread.php?t=1816530
Sent from my SPH-L710 using xda premium
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Just flashed back to LG2, so I'll update later and see how things are going.

[Q] Horrible signal. My problem or Sprints?

So today I have had issues with connecting to Sprint's network. In a city near mine, they are upgrading to 4G. My phone has been going from full signal to zero signal within seconds. It is killing my battery life. I am running CM10.1 with the current nightly. I restored a previous version of CM to see if it was an issue with the ROM and I was getting the same results. Do I need to flash the radios or leave it be? Could it be because of Network Vision? Is there a way to back up my current radios in case something goes haywire?

thekman24 said:
So today I have had issues with connecting to Sprint's network. In a city near mine, they are upgrading to 4G. My phone has been going from full signal to zero signal within seconds. It is killing my battery life. I am running CM10.1 with the current nightly. I restored a previous version of CM to see if it was an issue with the ROM and I was getting the same results. Do I need to flash the radios or leave it be? Could it be because of Network Vision? Is there a way to back up my current radios in case something goes haywire?
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Its most likely a carrier issue....make sure you have the most current radios installed which are FD02 if i remember correctly....other than that its a very rare occurance that software would affect your signal...probably due to the work that they are doing in the area....turn off LTE and see if the 3G signal does the same thing...good luck let us know what happens

Its sprints terrible network.
Sent from my Galaxy Nexus using xda premium

I've turned off 4g, reconnected with airplane mode, restarted my phone, fixed permissions. 3G is the same. I hardly have any service. The thing is, the past couple weeks the service here has been awesome. Then yesterday, this.
Sent from my Galaxy Nexus using xda app-developers app

thekman24 said:
I've turned off 4g, reconnected with airplane mode, restarted my phone, fixed permissions. 3G is the same. I hardly have any service. The thing is, the past couple weeks the service here has been awesome. Then yesterday, this.
Sent from my Galaxy Nexus using xda app-developers app
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Like i said its most likely the work that they are doing .... Give it a couple days because the same thing happened to me when Verizon was putting up their towers near me when i had my thunderbolt....give sprint a call see whats going on
...check their website see what it says for your area....for what its worth I'm 99% sure its their doing

JamesPumaEnjoi said:
Like i said its most likely the work that they are doing .... Give it a couple days because the same thing happened to me when Verizon was putting up their towers near me when i had my thunderbolt....give sprint a call see whats going on
...check their website see what it says for your area....for what its worth I'm 99% sure its their doing
Click to expand...
Click to collapse
Well, I have confirmed it to be on Sprint's end. All it took was a quick drive around town to pick up a different tower. My buddy has a signal booster in his apartment and I was picking up full bars there. Here's hoping LTE is close!

Anyone notice their service getting worse?

At first I thought it might have been my rom, but it seems it's happening with my GF's note 2 also.
Coverage we used to receive in some areas is almost completely gone. It will show signal and the 4g symbol but basically have NO internet service whatsoever.
On a better note, we've been receiving coverage in some areas we don't usually have it.
I'm hoping this is just a temporary thing due to the attempts to upgrade towers for LTE.
I don't know if it's because of the UVBMB4 update, but t-mobile service has been pretty crappy lately. Period.
We're in the San Gabriel Valley area.
Link for older UVALL4 modem below, people seem to experience better service
http://forum.xda-developers.com/show...php?p=36786363

I believe my service has suffered as well. Before the last update that enabled our Lte radios, I had great speeds, now it's slowed Way down. I'm in San Diego CA. Hope that it's just as the Op said, LTE towers being updated and what not.
Sent from my SGH-T889 using xda premium

Definitely have noticed a deterioration of service over the past month here in NYC.

Its because for some reason that new LTE APN is slow on HSPA+.. unless you have LTE in your area switch to the EPC APN. You can find the settings online. Its litter ally consistently a difference of 6+ mbps I have extensively speed tested lol..... click thanks if this helped
Sent from my SGH-T889 using xda premium

I also had problems even with old apn.
Flashed previous radio and service is top notch again.
Sent from my SGH-T889 using xda premium

Same here, I thought it was rom related.

YES! My service has sucked royally for the past month or so. Data latency/hangups/slowness, and the signal will just completely go away sometimes. I noticed that it started as soon as I flashed the most recent radio too, I'm about to go back to the old one.

Count me in, even my regular phone reception went from 4 bars no 1 or 0!

Can anyone point to towards old radio to flash? I go from no signal downstairs to full bars upstairs...theres an obv issue with new radio.

Yup I've noticed this beginning this week I've made zero changes to the phone. I used to get full bars at work and this week it bounces between full and 1 bar regularly. Theure messing with towers for sure
North Carolina by the way. Charlotte. Big City of 1 million people.
Sent from my SGH-T889 using Tapatalk 2

nxneko said:
Can anyone point to towards old radio to flash? I go from no signal downstairs to full bars upstairs...theres an obv issue with new radio.
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?p=36786363

nxneko said:
Can anyone point to towards old radio to flash? I go from no signal downstairs to full bars upstairs...theres an obv issue with new radio.
Click to expand...
Click to collapse
I'm also experiencing significant decrease on data speed. Has your data speed improve after flashing with older radio and APN setting?
Sent from my SGH-T889 using Tapatalk 2

zen0s said:
I'm also experiencing significant decrease on data speed. Has your data speed improve after flashing with older radio and APN setting?
Sent from my SGH-T889 using Tapatalk 2
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I was getting about 9/0.6 and with flashing back Im getting... 14/2 Though Ive been on HSDPA 15 & 21. Though Im not getting 4G as much, but it was sporadic anyways and I lost signal...and now I am not. So, Im happy now even though I am on 3G. However... in my corner big red has same problems as they wanted to not have tons of towers in this corner and theres only a ATT Tower....for a decent distance. basically reception fringe. though I am a new subscriber so i haven't experienced normal TMO, I literally got my device yesterday around 6pmish but it def wasn't normal and flashing previous radio did fix it like it solved everyone elses issue

janjannsen99 said:
Yup I've noticed this beginning this week I've made zero changes to the phone. I used to get full bars at work and this week it bounces between full and 1 bar regularly. Theure messing with towers for sure
North Carolina by the way. Charlotte. Big City of 1 million people.
Sent from my SGH-T889 using Tapatalk 2
Click to expand...
Click to collapse
my problems started last friday. i have limited to no service at all; no data, no voice, even no signal at times (circle with line through it, not just no bars). when i do get a signal, the phone refuses to register on the network. when im at home, i have intermittent service. i miss calls, texts wont send, if i do get a working call, it drops after a bit. there are times when it works fine, even on LTE but it never last long. went to the tmo store last night and they gave me a new sim which didnt do squat. already done the factory reset option (twice). phone has never been rooted, all stock. im in the KC metro so not like in the middle of nowhere. they said my next step is a warranty replacement phone if the sim didnt help. not sure if my problem is at all related to everyone elses in this thread, but yeah, service has sucked.

One of the issues, especially if you switch from 4g to edge to gprs a lot, is a setting in the new modem.
It's something called acquisition order. It has 3 settings:automatic, gsm_umts, umts_gsm. In short it tells the phone what kind of network to prefer. It will search for and use that type of network first.
Prior to the latest update it was set to auto. Now it is set to prefer umts. For some reason this has caused an issue I've come to call phantom 4g. Where it'll say 4g with no bars and no data service.
That is my guess. I'll look into it further.
Sent from my SGH-T889

Thanks guys for the heads up on switching to an older radio, I dont have LTE in Miami yet and was having slow internet for the last 3 weeks, I just switched and wow! What a difference. I'm also using the Epic APN.

I also noticed that speeds were degraded after the update. However, there is a simply fix to make your web a tad bit faster....
Go into your network settings, and switch your mobile network from LTE/4g/3g/2g to just 4G/3g/2g
your device will stop looking for an LTE connection and will just utilize HSPA+
Made a world of a difference on my own device. Connecting to the play store, opening web pages, everything was right back to where it was before the update.
Obviously if you live in an LTE area, there is no need to do this...

newageoutlaw said:
I believe my service has suffered as well. Before the last update that enabled our Lte radios, I had great speeds, now it's slowed Way down. I'm in San Diego CA. Hope that it's just as the Op said, LTE towers being updated and what not.
Sent from my SGH-T889 using xda premium
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I dont know about you but I live in san diego too my data speed stay above 10meg and max is 15meg.
Sent from my SGH-T889 using xda app-developers app

So I'm gonna be a noob here for a sec. When people say they are flashing the previous radio (I'm referencing the link that was posted) are people just flashing the modem from the section under the most recent? (the one with the January date on it). Just thought I would ask. Better safe than sorry. Thanks!
Sent from my SGH-T889 using xda app-developers app

superkamiguru31 said:
So I'm gonna be a noob here for a sec. When people say they are flashing the previous radio (I'm referencing the link that was posted) are people just flashing the modem from the section under the most recent? (the one with the January date on it). Just thought I would ask. Better safe than sorry. Thanks!
Sent from my SGH-T889 using xda app-developers app
Click to expand...
Click to collapse
Yup, radio is synonymous with modem in this case. UVALL4 is the previous version.
Hastily spouted for your befuddlement

horrible speeds lately

Lately ive been getting like .32 mbps I usually get at least 6mbps it started happening about 2 weeks ago whem I went out of town I thougt maybe ots the place im in but im home now and it still happens not matter the rom or anything it really sucks can someone help any help at all is greatly appreciated

WzrdCuD said:
Lately ive been getting like .32 mbps I usually get at least 6mbps it started happening about 2 weeks ago whem I went out of town I thougt maybe ots the place im in but im home now and it still happens not matter the rom or anything it really sucks can someone help any help at all is greatly appreciated
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Click to collapse
Ssme goes with me but, I called tmobile ask about they told me that they updating or somrhing on the towers around my area. Its been like this for more then a week.
Sent from my SGH-T889 using xda app-developers app

culua said:
Ssme goes with me but, I called tmobile ask about they told me that they updating or somrhing on the towers around my area. Its been like this for more then a week.
Sent from my SGH-T889 using xda app-developers app
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Click to collapse
Yeah I dont think thats my problem though because my girlfriend has tmobile and she is not rooted but her phone works perfectly she has the s3 and ontop of that everytime I restart my phone the speeds return to normal for like 5 min then go back to the really slow speeds and my plan is unlimited

WzrdCuD said:
Yeah I dont think thats my problem though because my girlfriend has tmobile and she is not rooted but her phone works perfectly she has the s3 and ontop of that everytime I restart my phone the speeds return to normal for like 5 min then go back to the really slow speeds and my plan is unlimited
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I have been on the phone with TMO about the same thing for over a month, plus my issue goes a little further. I will lose connection to a tower and not get texts or calls until I reboot the phone.
TMO had me replace the phone and SIM card, then opened a ticket with the Engineers in Las Vegas to troubleshoot, their response was that it was a known issue and would be resolved in the next weeks or months.
Everything ran fine until they pushed out the 4G LTE update, after that the service has been horrible.... even after that update that was supposed to resolve it...
I am wondering if there is a ROM out there that someone built to address this issue as I have about had it...
I am rooted but haven't thrown a ROM on it .... yet

NTFDAWY said:
I have been on the phone with TMO about the same thing for over a month, plus my issue goes a little further. I will lose connection to a tower and not get texts or calls until I reboot the phone.
TMO had me replace the phone and SIM card, then opened a ticket with the Engineers in Las Vegas to troubleshoot, their response was that it was a known issue and would be resolved in the next weeks or months.
Everything ran fine until they pushed out the 4G LTE update, after that the service has been horrible.... even after that update that was supposed to resolve it...
I am wondering if there is a ROM out there that someone built to address this issue as I have about had it...
I am rooted but haven't thrown a ROM on it .... yet
Click to expand...
Click to collapse
Im guessing you updated your phones softwarem if so, you may want to downgrade to a 4g non-lte radio, and set yourself up on a 4g apn as well. It should help at least until rhey correct their tower issues. 4g is still pretty fast and at least your mms / signal will work as you will be back in the 4g towers instead.
Edit
Actually try this:
Settings--> wireless and networks / more settings --> mobile networks --> network mode --> and select the automatic 4G /3g /2g setting
Then go to access point names and add a new one. The only 4 lines you need to edit are as follows :
Name - Tmobile 4g
APN - epc.tmobile.com
MMSC - http://mms.msg.eng.t-mobile.com/mms/wapenc
And
Apn type - default,supl,admin,dun,mms ( no spaces inbetween the comas )
Give it a shot and let us know if it helps. It should force you back onto the 4g towers which use a different frequency. If you still have issues, then keep all these settings active THEN try an older 4G radio.
Sent from my SGH-T889 using xda app-developers app

Just like pyraxiate up here just said is exactly what i was going to say. Go to this thread right here, http://forum.xda-developers.com/showthread.php?t=2102380 , & flash the last modem which is T889UVBMB4. I was using the T889UVBMD1 modem at 1st & was getting ok service but it just got to the point it was way to slow. I still go back to the T889UVBMD1 modem once and a while with the latest 4g lte apn but 75% of the day it is just way to slow of a combo. Like mentioned id also suggest flashing the T889UVBMB4 modem with the T-MOBILE US apn setting on this thread, http://forum.xda-developers.com/showthread.php?t=2208408 . There's only one page on the thread so it will be right there when you scroll down.

sIpInWiT mYdRoId said:
Just like pyraxiate up here just said is exactly what i was going to say. Go to this thread right here, http://forum.xda-developers.com/showthread.php?t=2102380 , & flash the last modem which is T889UVBMB4. I was using the T889UVBMD1 modem at 1st & was getting ok service but it just got to the point it was way to slow. I still go back to the T889UVBMD1 modem once and a while with the latest 4g lte apn but 75% of the day it is just way to slow of a combo. Like mentioned id also suggest flashing the T889UVBMB4 modem with the T-MOBILE US apn setting on this thread, http://forum.xda-developers.com/showthread.php?t=2208408 . There's only one page on the thread so it will be right there when you scroll down.
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Already gave him those settings in my post to him Hopefully he gets his issue fixed though!
Sent from my SGH-T889 using xda app-developers app

It's screwed from coast to coast. Been back and forth driving from california to pennsylvania, and the network is spotty on LTE within LTE markets, otherwise it runs great until it hiccups.
Seems like you get the equivalent of 'buffer overrun' issues from cd burning. Gert a bunch of data quickly, then stops for a minute to sort it out, then another data burst.
Seems like it happens to deliver a handful of megs of data, then practically loses network service for a few seconds, then another couple megs of data.
Just what i've seen running around nationwide.
LTE is fast when you find it though, nowhere near the speed of my verizon LTE service, but I can live with it.
Hopefully once they finish the LTE rollout it'll be back to normal.