Develop Bugs

LTE mode on an LT28i won't enable

I have a stock/generic LT28i from Asia. Totally unlocked and all. I'm in the US off and on, so I got a post-paid AT&T plan with data. 3G works great on my HTC One X (European version, meaning no LTE). I popped the SIM in my LT28i and 3G works, but not LTE. If I try to change the network mode to LTE/WCDMA/GSM, it instantly switches back to WCDMA/GSM. If I put my 3 Sweden SIM in the phone, I can set it to LTE/WCDMA/GSM and see [LTE] AT&T in the network search list. So it seems like there's some switch in the software that's forcing LTE off for my AT&T SIM. Any idea what's going on and how I can fix it? I was having issues with my phone bootlooping so I did a full reflash of the generic 6.1.E.2.29.

Is that account setup for LTE with AT&T?
Sent from my Sony Xperia S

mroach said:
I have a stock/generic LT28i from Asia. Totally unlocked and all. I'm in the US off and on, so I got a post-paid AT&T plan with data. 3G works great on my HTC One X (European version, meaning no LTE). I popped the SIM in my LT28i and 3G works, but not LTE. If I try to change the network mode to LTE/WCDMA/GSM, it instantly switches back to WCDMA/GSM. If I put my 3 Sweden SIM in the phone, I can set it to LTE/WCDMA/GSM and see [LTE] AT&T in the network search list. So it seems like there's some switch in the software that's forcing LTE off for my AT&T SIM. Any idea what's going on and how I can fix it? I was having issues with my phone bootlooping so I did a full reflash of the generic 6.1.E.2.29.
Click to expand...
Click to collapse
You may need an AT&T 4G LTE compatible SIM card. I had the iPhone 4 with the mini sim and when I got my Xperia ion they told me I needed a new LTE SIM despite the fact that my then current SIM would have fit the in the ion (and they look the same, except my old SIM had the 3G logo on it).
Maybe you current sim is att 3G.

Same thing happened to me a few times. Kept switching to wcdma preferred. Try clearing cache, dalvik and reboot. Eventually I did get it to stick. Also when this happened to me Rogers network was having an lte outage, so that might have had something to do with it. But persistence did pay off in the end.
And yes you obviously do need an lte sim and the lte apn's for whatever network you're on.

Is your APN set correctly?
Sent from my LT28i using Tapatalk 2

Probably figured it out, and never bothered to post something to mark this thread as resolved. Now people that search and find this thread will never know the solution.

Imdking said:
Probably figured it out, and never bothered the post something to mark this thread as resolved. Now people that search and find this thread will never know the solution.
Click to expand...
Click to collapse
Ah sorry, I actually gave up and put the SIM in my One X (HSPA-only version) instead. 3G was good enough for my needs. Maybe on my next trip to America I'll put more effort into it.

having the same issue
I'm having the same issue, built I'm on net10, which is supposed to support lte speeds, but i don't get higher than 3g for their att compatible service.
Also, unable to root after phone overheated and did original gb att to gb lt28i, to ics.. the rootme or e4root neither one would work. I've got backups, but they're under titanium backup and cwm, of which neither can i access without root. Is there an .ftf firmware prerooted on ics that doesn't require anything but flashtool to install and add cwm, since I'm sure I'm not the only person with such an issue. If I've overlooked it, direct me to the page where it is, all I've found so far is stock roms, and deodexed, which i can't use.. Also, my boot loader is locked.. I've checked all threads about root and ion, and noon have been helpful with my recent issues..any downloads needed to rectify this and not the usual I've already done that loop back to the same popular pages would be helpful and appreciated. Thanks in advance.

EDIT: sorry, i didn't see how old this thread was...and to the above, i'm not sure if what it wrote applies to your network...but most likely you need to look into APN settings required by your carrier...

Need help on Tmobile

Got my zl today excited then let down by problems with internet, so i insert sim and it picks up tmobile and auto download settings then when it start downloading google play apps it hangs. I go to chrome loop up a page get "error 502 bad request the server could not resolve your request", i have full bars and H+ but wont connect. I also notice that when i insert the sim i can just pull it out with out pressing down on it. Any help...
UPDATE: Got it working just need to tweak the APN settings, for future tmobile user the automatic download setting are not correct here is the link for Tmobile settings http://support.t-mobile.com/docs/DOC-1979

Cool. I was using tue ones from the Somy app...
Skickat från min Nexus 4

T-Mobile
I know the ZL (6506) is capable of working with T-Mobile's new LTE network, but my question concerns the IMEI number and your account with T-Mobile. On AT&T, your account has to have an IMEI number that is known and recognized by AT&T so as to enable LTE connectivity. Is this also the case with T-Mobile??

dunnsantee said:
I know the ZL (6506) is capable of working with T-Mobile's new LTE network, but my question concerns the IMEI number and your account with T-Mobile. On AT&T, your account has to have an IMEI number that is known and recognized by AT&T so as to enable LTE connectivity. Is this also the case with T-Mobile??
Click to expand...
Click to collapse
The info or where you got your info is incorrect. you DONT have to have a IMEI number that is known to AT&T to have LTE. I have changed phones prob 20 times since I got my first LTE phone and NEVER had to change it again.
You can be on the LTE data plan and everything work fine on a old dumb edge phone then put the sim card back in an LTE device and it still work fine...
LTE worked fine on a Canda Note 2 and One X

Same here. TMo does not care. I just started using my ZL teo days ago, before that was Nexus 4. Just took the SIM from the N4 and inserted in the ZL. All works!
Skickat från min Nexus 4

Hey people, I'm seriously considering picking up a Sony Xperia ZL C6502 Black. I'm aware that it doesnt support LTE on either network, but the price is insanely lowwww! My question is, does anyone know what kind of speeds I can expect to see on TMO and ATT respectively? I'm currently using an ATT Gnote 2 on ST/ATT and I have a Nexus 4 as a backup which I use on the TMO $30/"unlimited" data plan. I only point this out to indicate that I don't get LTE speeds now, which sorta makes it a "You can't miss what you never had" type of deal. I roughly get about 14-17mbs down on either device. Is there any chance I'd enjoy the same with the 6502 on either of these plans??? Any help/insight or even opinions, would be greatly appreciated.

The speeds to expect will be the same as you have now.......
Sent from my C6502 using xda premium

cheapshot789 said:
Got my zl today excited then let down by problems with internet, so i insert sim and it picks up tmobile and auto download settings then when it start downloading google play apps it hangs. I go to chrome loop up a page get "error 502 bad request the server could not resolve your request", i have full bars and H+ but wont connect. I also notice that when i insert the sim i can just pull it out with out pressing down on it. Any help...
UPDATE: Got it working just need to tweak the APN settings, for future tmobile user the automatic download setting are not correct here is the link for Tmobile settings
Click to expand...
Click to collapse
i just received my ZL C6502 today and noticed that the data connection does not work at all. i followed the APN settings on the t-mobile link you gave and still no dice (it does show full bars and H+ as you mentioned and when i switch the SIM to my old G2X its on full HSPA+ speed). i left the house and it was running ok suddenly and streamed netflix, etc. but when i went home it lost the connection again. I'm suspecting that this phone does not really work on t-mo's 1700 AWS even though the box says so and that i only got online outside the house because that area is on the 1900mhz refarm. is there any difference to t-mo's AWS 1700 and regular HSPA 1700mhz?! any insight or help is appreciated!!

I have a 6506 on TMo so I am limited in help. However, someone in my office has a 6502 on TMo and it is working fine. He had trouble until he manually set it. Same case as mine.
Perhaps you have a defective unit? Try removing and reinserting the SIM card. Perhaps a factory reset.
I had mine for almost a month and has been flawless in LTE when in DC and HSPA in Dallas.
Sendt fra min ZL 6506

The 6502 is the same as 6506 but without lte it should work I don't have 1900 coverage and I'm always on hspa and there's no lte were I'm at either. U need to make sure the apn is set exactly there should not be any values under proxy and port also under apn type have it blank that was the issue with mine those three things had values and was messing up internet. Also there's three different apn you have use. 1. Fast.tmobile.com (Lte), 2. Epc.tmobile.com, 3. Internet2.voicestream.com. Give it a try.
Sent from my C6506 using xda app-developers app

thanks for the help guys. ive gathered all that info earlier and did try the three APNs different combinations / proxy - no proxy, etc to no avail. i'm leaning on faulty hardware or messed up radio. i'll just sleep over it but so far its been disappointing :crying: great phone though...

As a quick update I did literally sleep over it and I'm happily up and running with hspa.. I literally left the phone alone overnight lol. Rooted the fone and all I need is to figure out how to get to recovery to put CWM since pressing vol up at boot is not working and flashboot isnt going either (that's for another post). Moody bastard this ZL is.. Anyway Thanks again!
Sent from my C6502 using xda premium

I have a 6506 on TMo without any issues. I live in LA without TMo LTE, but speeds have been as high as 18Mbps in West LA. I only have the issues of bad coverage at my house, but that's just TMo and not the phone.

hyelton said:
The info or where you got your info is incorrect. you DONT have to have a IMEI number that is known to AT&T to have LTE. I have changed phones prob 20 times since I got my first LTE phone and NEVER had to change it again.
You can be on the LTE data plan and everything work fine on a old dumb edge phone then put the sim card back in an LTE device and it still work fine...
LTE worked fine on a Canda Note 2 and One X
Click to expand...
Click to collapse
That's the thing you had an LTE phone AT&T had in their system when your account was provisioned for LTE so you never had a problem after that. For those people that have the ZL as their first LTE phone on AT&T they will have to first get the account setup for LTE using a phone AT&T recognizes on their network.
So basically put the SIM in an AT&T LTE phone, have AT&T provision it for LTE then once that's done you can put it in any other LTE phone and it will work fine
Sent from my Sony Xperia™ Z

[Q] GNex not working with Virgin Mobile after rom [AUS]

I bought a GNex on a plan from Virginmobile sometime last year with the intended purpose to use the sim in my tablet for data and the phone as a spare for when my current GNex died.
As the rom updates were managed by Virgin (and by managed I mean not up updated) I flashed stock JB4.2.2 on it.
Since then the phone wont connect to the Virgin network to make calls or use data.
I'm guessing its the stock radio it put on there.
Is there a way to use the Virgin sim it it?
on a side note of course the sim didnt work in my tablet either, so now I;m paying $29p/m for a phone I dont really need just yet.

neillh said:
I bought a GNex on a plan from Virginmobile sometime last year with the intended purpose to use the sim in my tablet for data and the phone as a spare for when my current GNex died.
As the rom updates were managed by Virgin (and by managed I mean not up updated) I flashed stock JB4.2.2 on it.
Since then the phone wont connect to the Virgin network to make calls or use data.
I'm guessing its the stock radio it put on there.
Is there a way to use the Virgin sim it it?
on a side note of course the sim didnt work in my tablet either, so now I;m paying $29p/m for a phone I dont really need just yet.
Click to expand...
Click to collapse
Faulty sim? try to get it replaced at a virgin store, check the apn'sare correct on the tablet for mobile data? try searching for the correct radio, for the network, I think from memory Virgin, uses the optus network.
Best of Luck

Correct Virgin does use Optus,
Where/how do I find an Optus radio for the Gnex?
thanks

Lte on m919v 4.4.2

OK i have tried to find the answer to this question i have a S4 M919V ( Videotron/Wind) on 4.4.2 (M919VVLUFNB5) And I'm currently with virgin mobile (Bell) i have evething set up to receive LTE on the phone. the sim card is LTE ready but i have no way of getting the phone to receive it.
I've tried to go into setting ( phone dial *#2263#) of that but nothing worked.
I don't mind rooting my phone but would love to get LTE without having to sell my phone and buying another one

humonculi said:
OK i have tried to find the answer to this question i have a S4 M919V ( Videotron/Wind) on 4.4.2 (M919VVLUFNB5) And I'm currently with virgin mobile (Bell) i have evething set up to receive LTE on the phone. the sim card is LTE ready but i have no way of getting the phone to receive it.
I've tried to go into setting ( phone dial *#2263#) of that but nothing worked.
I don't mind rooting my phone but would love to get LTE without having to sell my phone and buying another one
Click to expand...
Click to collapse
have you tried the settings here?
Settings/More networks/mobile networks
Your Network mode should show LTE,WCDMA (auto connect)
if not, tap on the network mode and select the LTE/WCDMA (auto connect) option and back all the way out.
Turn on airplane mode for about 30 seconds and then turn it back off and see what your results are.
You need to be SURE that LTE reception is possible where you are trying this. After all, no matter how good your hearing is, you won't hear me talking if you're out of earshot, right? LOL
Good luck!

Yeah I've tried it and for some reason I don't have this option but your right about checking if the lte is available before doing anything

humonculi said:
Yeah I've tried it and for some reason I don't have this option but your right about checking if the lte is available before doing anything
Click to expand...
Click to collapse
Do you have any S5 apps installed?
If using a build prop mod you can lose your LTE settings in "networks".
Pp.
sent from my bluetooth controlled toaster that also takes pictures.

I have an unrooted galaxy s4 running on stock 4.4.2

humonculi said:
I have an unrooted galaxy s4 running on stock 4.4.2
Click to expand...
Click to collapse
Thats strange, this issue has been encountered with rooted phones running stock/custom roms while running some mods.
You may have to do a factory reset, or stop by a TMOBILE store and let them check it out.
Pp.
sent from my bluetooth controlled toaster that also takes pictures.

humonculi said:
OK i have tried to find the answer to this question i have a S4 M919V ( Videotron/Wind) on 4.4.2 (M919VVLUFNB5) And I'm currently with virgin mobile (Bell) i have evething set up to receive LTE on the phone. the sim card is LTE ready but i have no way of getting the phone to receive it.
I've tried to go into setting ( phone dial *#2263#) of that but nothing worked.
I don't mind rooting my phone but would love to get LTE without having to sell my phone and buying another one
Click to expand...
Click to collapse
Does that phone even support LTE?
PanchoPlanet said:
Thats strange, this issue has been encountered with rooted phones running stock/custom roms while running some mods.
You may have to do a factory reset, or stop by a TMOBILE store and let them check it out.
Pp.
sent from my bluetooth controlled toaster that also takes pictures.
Click to expand...
Click to collapse
They don't have T-Mobile, and its not a T-Mobile device
Sent from my SGH-M919 using Tapatalk

On 4.2, my friend, with the exact same phone was able to force lte. But cutting any phone line

humonculi said:
On 4.2, my friend, with the exact same phone was able to force lte. But cutting any phone line
Click to expand...
Click to collapse
Were they on the same network as you?
Sent from my SGH-M919 using Tapatalk

I don't know to be honest.
I got a legit lte sim car from virgin mobile because they offer lte and i've read that the t-mobile phone (m919) supports bell 's LTE frequencies

humonculi said:
I don't know to be honest.
I got a legit lte sim car from virgin mobile because the offer lte
Click to expand...
Click to collapse
Could be that it doesn't support LTE from your carrier.. I think it may be capable to support LTE but its disabled on that model.. I've seen people flash M919 modems and gotten LTE to work. Just make sure you do some research, and more research if you device to do this
Sent from my SGH-M919 using Tapatalk

I've been rooting my phone as if it was a normal t-mobile m919 but I tried searching for into to see it there was a way to simply make my V (m919V) disappear and solve all my problems but nothing yet I know you can but as far as warranty, brick and risks go I have not found much information regarding this issue and that why I started this post
I wanted to say thank you to everyone for your help and suggestions

OK I've done some research and it seem that the m919v has the lte hardware to run the frequency 700
( http://www.morecellphone.com/compar...vs-samsung-galaxy-s4-lte-gt-i9505-64gb/340724)
And that virgin mobile (bell's network)
(bell is one of the biggest telecommunications companies in canada)
has this frequency on their network
(http://en.m.wikipedia.org/wiki/List_of_LTE_networks)

The only thing is that the lte frequency off 700 was lunched in Ontario last month and I'm in Montreal
But the fact that t-mobile only has 1700 and that virgin uses this here means that the phone isn't the problem and with this information, i've concluded that it a software issue

serio22 said:
Were they on the same network as you?
Sent from my SGH-M919 using Tapatalk
Click to expand...
Click to collapse
So the question would be is There a way I can flash radio (baseband) without having everything getting messed up
And will i lose my data.
ive done a nandroid backup just in case. The phone is also rooted used T-Mobile files

Canadian i747m not working any network in Europe

Hello Everyone
I have Galaxy S3 i747m from Rogers. I went to Europe for holidays. I unlocked my phone in Poland. After that phone was working ok but internet was very slow. It was working on Edge although everywhere was LTE range. I was changing carriers-sim cards but was the same problem. Then I went to UK. There my phone stopped reading any network especially when I was in the building. My current carrier is O2. My phone sometimes says not registered on network or says nothing. I have no connection at all. I dont know what to do now.
I flashed a new rom from this forum Hyperdrive which is nice but it didnt change anything. I was also installing those two files ..modem_XXDME4__ and modem+ddemg2 but my phone stopped working at all. So I had to format and flash a rom again.
Please help me guys because I want to destroy this phone with an AXE. I give up.

Not sure what the situation is in Europe, but I had a similar problem when I bought an unlocked i747M and attempted to use it on my AT&T network in the US.
Phone calls were fine, but way slow data connectivity.
US LTE does not support International/Canadian phones. Something with the modem and bands used here vs Canada.
Might be the same situation where you are. The modem may not be compatible with the European network bands.
I know DocHoliday77 helped me with mine. He made it very clear you CAN NOT change the modem version. I have the US version now and all is fine.

That's the only thing I can think of too tbh. That or something is corrupt or there's some sort of hardware issue. Sorry, I know that doesn't help much.... Hopefully someone else may have thoughts to add...
Sent from my SAMSUNG-SGH-T999 using Tapatalk