[Q] Abroad and stuck no data! HELP! - T-Mobile LG G2x

Hello,
So i've got this nicely unlocked, shiny, G2x. (Running MIUI right now, please don't judge me) Anyways, I'm in Morocco, and am trying to use Maroc Telecom (IAM) which has 3g data (their site even claims HSPA+) and these are the frequencys they use:
GSM 900 / GSM 1800 / UMTS 2100
And copy pasted from the T-Mobile website, the G2x uses:
Quad band GSM (850/900/1800/1900 MHz), Dual band UMTS (1700/2100 MHZ Bands 1 & 4)
To me that looks compatible. Trouble is, i'm getting no data whatsoever, not even 2g, in an area that I know should have at least 3g. I've signed up for the plan correctly, I'm sure of that. And my G2x automatically picked up the APN settings when I first turned it on (and I verified that they are correct) but still not a hint of internet access. This is driving me crazy!! any hints would be greatly appreciated.

Just guessing, but does it think you're roaming. Maybe try enabling data roaming to see if it recognizes the data then.

fiffer1 said:
Just guessing, but does it think you're roaming. Maybe try enabling data roaming to see if it recognizes the data then.
Click to expand...
Click to collapse
It wouldn't be roaming if he bought a sim for that system as he says. Probably APN has a typo or not selected. Have to push radio button so it has a green dot to enable the APN. If that doesn't work then contact carrier to reset data on the account. I have had to do that in the past here in Thailand. Have you also tried turning the phone off and on, or doing airplane mode. Sometimes that is needed once.

Thanks for the responses!
Unfortunately, i've tried and double tried all those things, except getting the carrier to reset the data plan. I'll do that next. Now I just have to get through a bunch of menus in French & Arabic

Are you running Market Enabler. It can screw you up royally if you change sim and it was set to fake at boot. I had that on a Nexus One and had to factory reset the phone to get data working again when I changed sim.

Thanks for the advice. I don't think i'm faking my sim - unless that's something that comes with CM07 and I just don't know about it. Also I tried it on stock before flashing with no different result, so i'm pretty sure that's not it. Went to the office of Maroc Telecom, who replaced my sim (but still no luck) and an INWI sim which i'd previously been able to get 2g coverage on now gives me nothing. It is the weirdest thing and I feel stuck. Has anyone actually gotten a g2x to work on any other network?? is there some sort of Tmobile lock which is preventing me because i'm not using a tmobile sim? (And i'm not talking about the phone being 'locked', obviously i've gotten it unlocked, and can make calls just fine, and did have that short spell of 2g data on INWI) Anyways, i'm about ready to throw this very expensive phone out the window, because what is a smartphone without data?? Thanks anyways for your advice.

same, problem.
How can I solve it?
Maybe try to use other broadband?

I use my G2X in Thailand on TOT3G with no problems. They run 3G on Band 1 (2100/1900). Figure out what band it is. There about fifteen different 3G bands in use. Most people don't realize it but 3G radios use two frequency spectrums at the same time. There is an uplink and downlink. For example 2100 Band 1 uses 2100Mhz downlink and a 1900Mhz uplink. Band 4 is 1700Mhz uplink and 2100Mhz downlink. So the 3G radio in the G2X also transmits on 1900Mhz. But the 1900 Band 2 uses 1800Mhz as an uplink, which the 3G radio in the G2X doesn't support. Most companies that say they are on 2100Mhz are referring to Band 1. If they are running Band 1 the G2X definitely supports it. If you have sim unlocked the phone there is nothing preventing you from getting 3G reception on any carrier in the world.
Download "Network" (https://market.android.com/details?id=de.mangelow.network&feature=search_result) from the Android Market and run it. Scroll down to where it says what type of connection you want and make sure "WCDMA preferred" is selected. If the phone somehow got set to "2G only" you will never get 3G reception until you change it. That happened to me once on a Nexus One and took me a while to figure it out.
CM7 and some other custom roms are known to be having connectivity issues. I suggest you flash back to stock and make sure your apn is correct. If your apn is wrong in any way, the connection will be refused by the cell system.

answer to problem with 3G
engadget[dot]com/2011/04/27/t-mobile-g2x-lacks-quadband-hspa-shatters-dreams/
So, I have working 2G, and 3G(only data, calls are not working)
Rom: WeaponG2x.

Have you tried hard reset (press and hold vol^ and power) till it restarts..
Sent from my LG-P999 using xda premium

MisfitX said:
Have you tried hard reset (press and hold vol^ and power) till it restarts..
Sent from my LG-P999 using xda premium
Click to expand...
Click to collapse
For the what?

Related

Touch Cruise, HSDPA, Tmobile, US or EU?

I recently purchased an HTC Touch Cruise from phonesource-USA without doing my homework. (What can I say, I was overwhelmed by the coolness of the phone). Before this phone, I was using an Excalibur and a Titan from HTC. I think I already know the answer to this question, but wanted to ask the home experts out there.
I absolutely love this phone, but am I screwed on 3G when T-Mobile releases it this year?
P.S. I'm located in the U.S.
wagz said:
I recently purchased an HTC Touch Cruise from phonesource-USA without doing my homework. (What can I say, I was overwhelmed by the coolness of the phone). Before this phone, I was using an Excalibur and a Titan from HTC. I think I already know the answer to this question, but wanted to ask the home experts out there.
I absolutely love this phone, but am I screwed on 3G when T-Mobile releases it this year?
P.S. I'm located in the U.S.
Click to expand...
Click to collapse
T-Mobile USA Will use 1700mHz band for 3G and according to some sources it will use 2100mHz to. Witch T-Mobile say it will not have full experience of there 3G. But it will work.
And i think it will be possible to use Radio from Sony X1 witch have same Chip sets and everything except screen.
AT&T 3G
I think I may be in the same boat. I did read up on the phone before I bought it to work on At&t's 3G network. Even thought the phone operates on 1900mghz I have not been able to get it working. It always is on the Edge network.
sultanofsumar said:
I think I may be in the same boat. I did read up on the phone before I bought it to work on At&t's 3G network. Even thought the phone operates on 1900mghz I have not been able to get it working. It always is on the Edge network.
Click to expand...
Click to collapse
are you saying you have not been able to get the phone to work on att's 3G network? i've read on howard forums where other owners are seeing the "H" and "3G", suggesting that others have been able to connect...
3G
That's exactly what I am saying. I have had it configured to the correct frequency for AT&T's 3G since I turned it on. The very first time I put it on 1900 MGHZ I did see a H and then a G, but I'm sure the G was for GSM.
sultanofsumar said:
That's exactly what I am saying. I have had it configured to the correct frequency for AT&T's 3G since I turned it on. The very first time I put it on 1900 MGHZ I did see a H and then a G, but I'm sure the G was for GSM.
Click to expand...
Click to collapse
When you say "configured to the correct frequency for att's 3G", did you manually set the Band to 1900 mHz? or do you have it set to Automatic? for all my HTC devices that support 3G, i set the Band to Automatic and it will pick up and use the att 3G/H band automatically. i only see the "H" when i'm tethered to my laptop or downloading a 1 meg + file.
att 3g
I did it manually. I figured it wouldn't work on auto. I will try the auto detect and see what happens.
3g is up
Well it says G right now, but not 3G. I know I have crappy reception here so maybe it will change. Thanks though.
yep... having good HSDPA/UMTS coverage is a must to access the network. if it says "G", you're using GPRS, "E", you're using Edge, "3G", you're using UMTS, "H" you're using HSDPA. you might check att's website to see if you have high-speed coverage in your location. every HTC 3G capable device (e.g., supports Triband HSDPA) that i've purchased has always connected to att's network with the "Auto" Band setting...
kolobok01 said:
T-Mobile USA Will use 1700mHz band for 3G and according to some sources it will use 2100mHz to. Witch T-Mobile say it will not have full experience of there 3G. But it will work.
And i think it will be possible to use Radio from Sony X1 witch have same Chip sets and everything except screen.
Click to expand...
Click to collapse
Ah this sucks. Why can't America just use the same frequencies as the rest of the world. I don't want to have to purchase another expensive phone right after purchasing this one. Looks like a Sony X1 will eventually be in my future
Thanks for the reply.
3G???
I had it on auto all day, but no little 3G icon. I know there is coverage, becuase my TYTN and even my blackjack picked it up right away. I guess I'll just keep looking..........
AT&T 3G
I am usually indicating 3G or H. I have it set to auto and it semms to be working fine for me.
mpf54 said:
I am usually indicating 3G or H. I have it set to auto and it semms to be working fine for me.
Click to expand...
Click to collapse
I too have found you need to leave the phone set to Auto. A soft reset after you change it from manual selection to auto gets me the 3G back immediately on boot up.
ATT 3G
I have ATT 3G & H in some areas when I travel but my home area does not have 3G coverage only EDGE at the moment. It depends on ATT's coverage whether you will get 3G or H. The phone is fully capable to work with ATT.
got my Orbit 2 today, and HSDPA & UMTS are working fine (in dallas)...
using a polaris with at&t in buffalo, ny. 3g and HSPDA work fine in most areas. sometimes if i go deep within a building it will swtich to edge which is normal.
3G!
cortezzi said:
When you say "configured to the correct frequency for att's 3G", did you manually set the Band to 1900 mHz? or do you have it set to Automatic? for all my HTC devices that support 3G, i set the Band to Automatic and it will pick up and use the att 3G/H band automatically. i only see the "H" when i'm tethered to my laptop or downloading a 1 meg + file.
Click to expand...
Click to collapse
Well now that I put everything on auto and soft reset I am gettin 3G and H UMPTS all over the place. Thanks!

Is there a way to force the Inspire to use 1900 instead of 850?

On my Captivate, I could customize the radio to remove and add bands. Is there a way to do this on the Inspire? I live in an area where we have so many towers that even though I'm considered in the "best" coverage zone, my phone rapidly hops towers. Setting my Captivate to use the 1900 band only eliminated this issue entirely.
I may have to return the phone if I can't do this because I constantly drop calls and data. The worst is when I am on a phone call - it will go from HSPA to EDGE and then the data connection icon disappears entirely until I get off the phone and/or the call drops - my Captivate did this as well until I set it as 1900 only.
I think one of the custom roms had this option, just can't remember which one. I know one of the desire based roms had a selection setting to force it to one or the other or to set it to automatic.
Sent from my Desire HD using XDA Premium App
stryfe2010 said:
I think one of the custom roms had this option, just can't remember which one. I know one of the desire based roms had a selection setting to force it to one or the other or to set it to automatic.
Sent from my Desire HD using XDA Premium App
Click to expand...
Click to collapse
I would be extremely interested in this. I am considering making a post in development about it because seriously, I am sick of trying to make a call and it fails because there is no signal, then I wait 30 seconds and I have full signal, get on the call, and it drops out.
This would be sweet to have, my phone is constantly doing the dame thing.
Sent from my Inspire 4G using XDA Premium App
Jake06 said:
This would be sweet to have, my phone is constantly doing the dame thing.
Sent from my Inspire 4G using XDA Premium App
Click to expand...
Click to collapse
Honestly, its a trade off - on my Captivate, I have to lock it as WCDMA 1900 - which means that when I drive somewhere that DOESN'T have 1900 (pretty rare in Colorado) AND HSDPA or 3G, I can't make a call but switching the band takes all of 5 seconds. I can tell you that 1900 here at home though locks and doesn't let go whereas 850 does. My SIM is currently in my Captivate because I'm going to call them and try to make a case for a microcell again.
On your phone, dial *#*#4636#*#* ...then select "Phone Information"
In this menu, you can change and set several things, including which band you use. This is on EVERY android phone, regardless of the ROM. You change these settings at your own risk.
EtherealRemnant said:
I would be extremely interested in this. I am considering making a post in development about it because seriously, I am sick of trying to make a call and it fails because there is no signal, then I wait 30 seconds and I have full signal, get on the call, and it drops out.
Click to expand...
Click to collapse
Don't return it cause of that..! I've already got the 1900/850(wcdma/gsm) toggle in my sense rom, I just haven't included it yet cause I'm working on a 3g/edge toggle as well, and wanted to have both together, but since people want that wcdma/gsm toggle now ill finish it up 100% this weekend hopefully, update my rom with it and post just that by itself so people on other roms can use it as well.
850MHz has WCDMA as well... Setting it to WCDMA/GSM is irrelevant, as you can be on 850 and still on WCDMA.
You have to be able to specify the 1900MHz or 850MHz bands themselves if that is all you want; rather than the auto-switching the phones are supposed to do.
id10terrordfw said:
850MHz has WCDMA as well... Setting it to WCDMA/GSM is irrelevant, as you can be on 850 and still on WCDMA.
You have to be able to specify the 1900MHz or 850MHz bands themselves if that is all you want; rather than the auto-switching the phones are supposed to do.
Click to expand...
Click to collapse
That is exactly what I want. I want to force the 1900 band only. On my Captivate, the only way to do this was to force WCDMA 1900 OR GSM 1900, there was no way to have GSM AND WCDMA 1900 because of how Samsung set up the frequency manager.
I'll try the *#*#4636#*#* mentioned earlier.
The phone doesn't respond to anything I set in *#*#4636#*#* - it automatically reverts back to HSDPA.
I also figured out my problem. Using OpenSignal, I did a tower map. As I thought, I have too many towers. There is one tower that is literally at the top of my block that gives me the worst signal and there are two other towers it connects to - one of them is about 4 blocks away from the other tower and gives me an okay signal and the other one is about a mile away and that gives me the best signal but it doesn't stay locked to any specific tower. Even sitting in the exact same spot, it keeps jumping around.
Oh and you can only select "USA bands", not individual bands from that menu as well
I can only use edge(gsm) 850 band in my office, rest of them don't work.
I used to select it very easily on my captivate using the *#2263#, but there is no such thing on Inspire 4G. Is there anyway to do the same on Inspire 4g??
ravishahuja said:
I can only use edge(gsm) 850 band in my office, rest of them don't work.
I used to select it very easily on my captivate using the *#2263#, but there is no such thing on Inspire 4G. Is there anyway to do the same on Inspire 4g??
Click to expand...
Click to collapse
You mean this?
*#*#4636#*#*
Sent from my calculator
on Captivate i could *#2263# and toggle between bands. GSM/3G or 850/1900.
kirk123 said:
You mean this?
*#*#4636#*#*
Sent from my calculator
Click to expand...
Click to collapse
on Captivate i could *#2263# and toggle between bands. GSM/3G or 850/1900.
On inspire *#2263# doesn't work. I tried *#*#4636#*#* as well. If i try to change bands it again defaults back to WCDMA. I can never switch to GSM bands.
If you live in a major area then its not uncommon to have up to 12 monitored cell sites capable of serving your phone.
I have both bands as well, and here is some info that may be of interest:
In areas that have both, there is a rather seemingly obscure pecking order:
Havoc is caused due to this:
Phone has every band available to it. Great! or, not really.
Here is the election process:
Tower sends out its info on the 850 wcdma carrier announcing as primary.
Tower sends out its SAME info on the 1900 wcdma carrier as secondary.
GSM primary is 1900 for association, 850 for data / voice with roll back to 1900.
The phone sends a limited amount of data to the towers when it hooks up, and in this data is the list of "Ranked" cell site ID's. (WCDMA ONLY, forget GSM for now)
The tower then is aware of what other sites can serve you should it become to busy. Using this and various factors, it will decide to either keep you on sector X primary, bump you to secondary carrier, or dump you completely. If it dumps you completely it is a forced hand off and not a graceful one, and you drop signal completely momentarily and then gain it back, but connect to a different cell id. However, that NEW cell ID only hears you at -104, useable but weak, and has 300 other phones it hears at -80 or better.. It has to pick some one to drop, and it picks you. Start the cycle all over again.
Disabling the 850 band stops this, because 1900 goes far shorter of a range and has far less people using it typically.. therefore the stronger site doesnt drop you because your phone reports no where to go. It also (in the case of the captivate) does not respond to requests to switch to GSM, as it will report no gsm availability when in forced wcdma mode.
Fundamentally, this is a misconfiguration on AT&T's part, since this little scenario shouldnt happen with proper sector alignment and tilting.
You did mention that you are in colorado, and AT&T has absolutely NO idea how to deal with radio towers and mountains. They seem to forget that not the entire world is flat.
If it is an option, I'd recommend a switch to Verizon, as it is unlikely this particular problem will ever go away.
Also, as to a Micro-Cell, know going in that those little buggers get the lowest possible priority.. meaning that if your phone can hear a real tower, its going to use that first. You'll have to fight it to get it on the m-cell.
Also, all Micro-Cell's are WCDMA 850 only, with no GSM or WCDMA 1900.
They also do not use HSPA, but instead use older UMTS technology (Who really cares at this point, if you are in range of a M-Cell you can use wifi.)
Other option: Disable 3G for the area you would use the M-Cell.
GSM shouldnt give the same problem WCDMA gives. The entire election process is completely different, and frankly works better than the WCDMA deployment AT&T used.
EDIT:
Wow sorry I didnt read the dates else I would have known this thread was a corpse. Found it looking for a WCDMA 1900 inspire lock option.

[Q] How to get 3G/4G with unlocked Blaze on AT&T

I bought one of these phones, rooted it, unlocked it, and installed CM9. I love the phone and OS, but I cannot get the 3G/4G to work on AT&T. Any ideas?
Yeah. The data network is incompatible. Different frequency.
Sent from my SGH-T769 using xda premium
Yeah I think all you can get is 2G (edge) on AT&T with the blaze.
I can say from first hand experience that the blaze works great with AT&T's 3g service. I bought this phone last week, unlocked it, and swapped in the sim from my old Aria and have been using it with CM10 ever since. Data speeds are around 3 to 6 Mb/s down and 1 Mb/s up, and voice and text messaging works fine.
For a more technical answer, AT&T uses the 850 mhz and 1900 mhz frequencies for UMTS (3g), and T-mobile uses 1700 mhz and 2100 mhz frequencies. The blaze supports UMTS on all of these frequencies so there are no technical roadblocks to using this phone with AT&T. http://www.phonearena.com/phones/Samsung-Galaxy-S-Blaze-4G_id6824
As for your problem of not getting 3g working, I had similar issues when first switching the sim card (especially on the stock rom). Check that your APN matches the one your old phone was using. On the stock rom, the phone did not auto detect the correct APN and this caused the 3g to not work. CM10 detected the correct APN right away though. Also, try turning data off and on or even rebooting the phone once you've checked your network settings.
I sold my other phone and no longer have it. Please confirm your APN settings, and how do I change them?
The blaze has all the frequencies necessary for it to do HSPA (3G/4G) on AT&T's networks.
You'll likely want to change the APN. On CM9/10, go to Settings -> Wireless & Networks + More... -> Mobile Network Settings -> Access Point Names.
I was careful in selecting this specific phone because of its compatibility with AT&T HSPA bands. I have tried the suggested tweaks to the APN settings within both CM9 and CM10, but I still get no visual notification that the phone is operating in 3G or 4G mode. The areas in which I have used the phone consistently provided 3G and/or 4G coverage consistently with my prior BlackBerry 9860.
Any additional tips/tricks would certainly be appreciated. I know this phone is capable of so much more than it's providing me at this point.
nellans57 said:
I was careful in selecting this specific phone because of its compatibility with AT&T HSPA bands. I have tried the suggested tweaks to the APN settings within both CM9 and CM10, but I still get no visual notification that the phone is operating in 3G or 4G mode. The areas in which I have used the phone consistently provided 3G and/or 4G coverage consistently with my prior BlackBerry 9860.
Any additional tips/tricks would certainly be appreciated. I know this phone is capable of so much more than it's providing me at this point.
Click to expand...
Click to collapse
have you tried running a speed test to see if maybe it's just that the icon isn't coming up?
That is why it was called the "Merger Proof Phone"

[Q] Can't turn on 1700 band

Hi All
I have a problem, and don't really know that to do. I have a Samsung Galaxy S Relay 4g, rooted, running the latest nightly and modem. Recently I went on vacation to Europe and while there used local sim cards from t-mobile Eu. At first nothing worked, Then I read some forums and from there learned of the *#*#4636#*#* code. Used the Select Radio Band option and switched to the Euro band selection. All was well Europe SIM cards worked Data, voice everything.
I get back to Canada, and I figure I need to switch back to the USA band. So I do. but still no service, no voice or data. I can get roaming. but that's not really an option. I see the network operators Bell and Rogers, but no Wind or Mobilicity(who use the 1700 band). I'm on wind. So to me it looks like the 1700 mhz band is turned off on my phone.
So far I have tried...
Used the *#*#4636#*#* multiple times switching bands...
Tried using the settings menu to select wcdma preferred or global
Re-flashing the modem
Flashing to the newest nightly
Tried a verified good SIM card
Nothing works....
I'm thinking I may have to go back to the stock t mobile software and try to turn on the radio there...
So does anyone have an idea what could be missing? Or how to specifically turn on the 1700 mhz band? The select radio band pop up only has two options Euro band and USA band.
Any help would be greatly appreciated!
Okay!
So I think I'm back up and running, all AWS networks in Canada show up. Haven't tried data or voice, but I'll be doing that on the way home from work...I'll post after if things still don't work...
So these are the steps I took....
1. Using CWM I did a full back up to an SD card.
2. Then using CWM I flashed the stock JB firmware from here http://forum.xda-developers.com/showpost.php?p=41209211&postcount=1
3. In the Dialer app. I dialed *#197328640# navigated through the gsm,lte,wcdma options and set the band selection to automatic.
4. Tested phone on stock to see if it picks up the networks...and it did!
5. Using CWM restored my original cyanogenmod install with all settings and software.
6. Tested network connectivity again, and the networks now show up.
On the way home I'll do some tests with data and voice.
Looks like everything works! woot!
It looks like there's a bug in the band selection code. It should be offering you the AWS frequencies, as well an an automatic everything choice.
I'll look into a fix for apexqtmo. In addition, I will nuke the CDMA options, they're not needed and probably causing other problems.
Sent from my SGH-T699 using Tapatalk 4

LG Phoenix 2 (K371) Network mode issue

Hello,
I've got a LG Phoenix 2(K371) phone that I bought from Bestbuy and unlocked through AT&T
The phone is supposed to support the UMTS B1(2100 Mhz) frequency (as stated in specs).
I'm in North Africa right now for a business trip and unfortunately I wasn't able to get any 3G data with the local carrier that uses the UMTS 2100 Mhz frequency, I'm stuck with only 2G while my other phone works just fine.
I tried to change my Network Mode from 4G to 3G but the Network mode menu is missing!!!!!!
My questions are:
1- Does the K371 really supports the UMTS 2100 Mhz frequency ?
2- How can I change my Network mode from 4G/Lte to 3g/WCDMA?
Thanks
Did you ever get this sorted out? I am in Germany and can only get 2G also.
Same here in the UK! Only 2G.
My understanding is that either the official specifications of the phone are wrong - it doesn't support the HSDPA frequency of 2100 MHz, or (most likely) this frequency is disabled in the phone software settings since [email protected] doesn't use this frequency in the US. In any case it is very frustrating: I bought this phone convinced it is going to work while I am travelling in Europe, but obviously it doesn't as 2G data connection is useless.
Same problem in SE Asia. Phone doesn't have the right LTE bands but HSPC should work. Only getting 2G. No option in the hidden menu to change the modem RAT settings that I can see. *#546368#*371#
Anyone have any luck using the k371 overseas?
Same here...
I tried every single method I know in hopes that I could root the phone, but no luck!!!
I believe at&t disabled the said frequencies....
Our only bet is a proper root, and a custom rom..
any update on no UMTS 2100Mhz?
any solutoion on this issue?
I have found a solution. I am using it outside the US. I contacted my cellular provider, gave them the phone name (LG K371) and they sent me a text message with automatic settings for their data network. As soon as I opened it, I got a message like "data settings have been updated" and now it works on 3G and 4G without any issues. You may also be able to find these data configuration settings on your cell service provider's web site.
Seriously???
Please let me know is it AIRTEL service? since i am from INDIA.
we have the same problem in 2 mobiles..
Hmmm
I tried of calling and received setting for MMS , GPRS, INERNET but still i m seeing 2G symbol as E - edge detection
Please help me
Hi this is sainath
am also facing same problem, any one got solutions
please give reply.
tromal said:
Hello,
I've got a LG Phoenix 2(K371) phone that I bought from Bestbuy and unlocked through AT&T
The phone is supposed to support the UMTS B1(2100 Mhz) frequency (as stated in specs).
I'm in North Africa right now for a business trip and unfortunately I wasn't able to get any 3G data with the local carrier that uses the UMTS 2100 Mhz frequency, I'm stuck with only 2G while my other phone works just fine.
I tried to change my Network Mode from 4G to 3G but the Network mode menu is missing!!!!!!
My questions are:
1- Does the K371 really supports the UMTS 2100 Mhz frequency ?
2- How can I change my Network mode from 4G/Lte to 3g/WCDMA?
Thanks
Click to expand...
Click to collapse
Sorry for a late reply, but here's the real scoop about the LG K371 (AT&T)
First, being a "cheap" LG phone, there are very few bands actually included, and they only cover the main (not all) AT&T US frequencies, therefore it's no surprise that doesn't work on all overseas carriers. Again, they are covering only major US bands, and despite what it shows on the box or specs it may not be always true. B1 (2,100Mhz) band has different sub-bands, therefore it doesn't mean that the US B1 will work on an overseas B1, let alone the air-interface (2G/3G/4G/LTE) may not all be supported even if this sub-band exists.
Second, being that it's an AT&T phone, they are knows to load firmware with major restrictions for band selection called RAT Restrictions, which cannot be undone unless you can reflash it with a non-customized firmware, but you can't do that either due to the locked bootloader. A better option is to always go with the un-customized or Tmobile K7/K8 because they always have a lot more bands enabled than the AT&T version. Better yet, go with a Samsung which have more bands even on the AT&T models.
Bottom line, "cheap" phones along with AT&T restrictions will not work everywhere, despite the specs, and there's nothing you can do about it.
And my favorite old adage is "You get what you pay for!" LOL

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