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[Q] My phone will not roam. Grrrr....

Verizon SGS3. Running CM 10.1, last nightly (not 10.2).
I'm in Canada and my phone will not connect to a network of any kind. My wife's Iphone connects, so it's not a Verizon issue. When I go to phone status it just tells me "Searching for service" under network, and mobile network state is "disconnected".
I have "Automatic" selected under System Select, and my Network Mode ls "LTE/CDMA/EvDo". I've tried changing all of this and it just won't find a network here, I mean no cell service (no data either, but that's not crucial for me). I feel like roaming is just turned off and I can't turn it back on.
Any help would be appreciated.

Do u have an IMEI? (under about phone)
Sent from my SCH-I535 using Tapatalk 4

Sandman-007 said:
Do u have an IMEI? (under about phone)
Click to expand...
Click to collapse
Thanks for the reply. Yes, I do. My IMEI is intact, as is my phone number.
I should add that I was unable to make this phone work as a GSM phone in the UK, had the same issue (no cellular reception), I don't know if that's related or not. I also tried to use some Nandroid backups I had going back as early as Feb of this year and still no go.

I just got this phone a few days ago and so I don't really know this phone that well. Maybe someone will chime in.
Sent from my SCH-I535 using Tapatalk 4

solved
After doing a complete wipe & odin back to factory it still didn't work.
Back on cm10.1.2 now &I used the "phone info" app to select PCS (1900mhz) band. My phone immediately picked up the cell network. No data, but I'll take it! For some reason being on the multi band labeled USA wasn't getting me anything & my phone wouldn't auto-select. Not sure if it's a bad sim card or what.

[CLOSED][Q] Unlocked Relay getting no signal on a non-TMo carrier

EDIT: No feasible solution found, so I had the device sold. Question closed.
UPDATE ON THE ISSUE: It seems that it would not recognize WCDMA networks (GSM works properly), hence no signal on my WCDMA-only SIM card. Any ideas?
Hello all, new joining the Relay 4G forums
Long story short, so I got my Relay 4G today, but it just wouldn't fully recognize my China Unicom SIM card. Symptoms and information:
1) No signal
2) Correctly displays my carrier's name, but says "emergency calls only"
3) Can search for available carrier networks, including China Unicom, but fails to register on the network - it says "unable to connect, try later"
4) The device has a correct IMEI instead of a generic one
5) Doesn't prompt me to enter SIM UNLOCK CODE when I first plugged in the SIM card
6) SIM unlocking procedures posted in the forum doesn't help - the phone should be unlocked when I bought it
7) It recognizes another SIM card from China Mobile (WTF!!) and works properly
8 ) China Unicom uses the 2100MHz band, which is supported by Relay 4G
So now I'm out of ideas... Any help would be appreciated. Thanks
Sent from Google Nexus 4 @ CM11

See this thread for sim unlock. http://forum.xda-developers.com/showthread.php?p=40835465

croogrog said:
See this thread for sim unlock. http://forum.xda-developers.com/showthread.php?p=40835465
Click to expand...
Click to collapse
...So this phenomenon means this really is SIM-locked? Good, I'll revert to ICS and try unlocking with that method...
One question: why doesn't it prompt me to enter unlock code when I inserted the SIM?

@croogrog It didn't turn out to be that simple... SIM unlock procedures didn't work at all even though I got all the timings right. I think the problem isn't caused by SIM lock... But what can it be?
Sent from Samsung Galaxy Nexus @ CM11

Bump
Sent from Google Nexus 4 @ CM11

More strange symptom: another SIM from China Unicom got recognized quickly after I inserted it. I don't understand this...
Sent from Google Nexus 4 @ CM11

If other SIMs are working and you are able to call someone your phone was unlocked when you got it.
If your SIM isn't working it could be that you need a new one from your provider.
I had that problem years ago. My phone was too new ...or my card too old.
SGH-T699 (Relay 4G) Talk with a little Tapa

C3POID said:
If your SIM isn't working it could be that you need a new one from your provider.
Click to expand...
Click to collapse
Hmm, my not-working SIM is bought just days ago... I'll go to my carrier's deck and see if they could swap me a new card.
Sent from Google Nexus 4 @ CM11

AndyYan said:
I'll go to my carrier's deck and see if they could swap me a new card.
Click to expand...
Click to collapse
Good luck.

AndyYan said:
Hmm, my not-working SIM is bought just days ago... I'll go to my carrier's deck and see if they could swap me a new card.
Sent from Google Nexus 4 @ CM11
Click to expand...
Click to collapse
Where did you buy the phone from?

gtmaster303 said:
Where did you buy the phone from?
Click to expand...
Click to collapse
From a local importer at TaoBao (China's equivalent of eBay).
UPDATE ON THE ISSUE: I changed my SIM card for a new one at my carrier's but still won't recognize. Adding in the symptom that it can recognize another China Unicom SIM, I guess I can conclude that the problem lies within this particular SIM.
Sent from Samsung Galaxy S Relay 4G @ CM11

AndyYan said:
From a local importer at TaoBao (China's equivalent of eBay).
UPDATE ON THE ISSUE: I changed my SIM card for a new one at my carrier's but still won't recognize. Adding in the symptom that it can recognize another China Unicom SIM, I guess I can conclude that the problem lies within this particular SIM.
Sent from Samsung Galaxy S Relay 4G @ CM11
Click to expand...
Click to collapse
Best test would be to try another carrier sim all together. Not china unicom. See if the phone takes it. That way you will know for sure that it's unlocked and works. Unfortunately, there's no way to check if it's unlocked, other than to test sim cards
My next suggestion would be to consult samsung for a warranty repair, because your phone might be faulty. Or consider asking the seller that you got it from to send you another one. Let us know if you still need help
Sent from my Galaxy S Relay

gtmaster303 said:
Best test would be to try another carrier sim all together. Not china unicom. See if the phone takes it. That way you will know for sure that it's unlocked and works. Unfortunately, there's no way to check if it's unlocked, other than to test sim cards
My next suggestion would be to consult samsung for a warranty repair, because your phone might be faulty. Or consider asking the seller that you got it from to send you another one. Let us know if you still need help
Sent from my Galaxy S Relay
Click to expand...
Click to collapse
1. I checked with a China Mobile SIM and it works. Also, as said before, another China Unicom SIM also works. Only this specific SIM doesn't. It IS unlocked when I purchased it.
2. No way for a warranty - I'm in China and this is a T-Mobile USA device that many local "smartphone gurus" haven't even heard of, let alone "repairing" it.
3. The importer only has one such device in perfect condition (others have plenty of worn and torn), so exchanging is not possible...
I'm thinking of setting up an alternative solution for now...

More update on the issue: even on the China Unicom SIM that got recognized, it wouldn't connect to WCDMA/HSPA+ networks. Did an experiment: I used *#*#4636#*#* to adjust network modes, and when the device is on GSM only / GSM/WCDMA auto / WCDMA preferred, it would receive signal like normal; however, choosing WCDMA only, no signal is received. It seems like the real issue lies within the device after all...
Sent from Samsung Galaxy S Relay 4G @ CM11

...The Relay isn't a WCDMA device.

Even though the relay is a US tmobile device i would still try to contact samsung. They may be able to help you and it can't hurt. This is certainly not the first Relay to leave the US and incur problems...
Sent from my Galaxy S Relay

Jax184 said:
...The Relay isn't a WCDMA device.
Click to expand...
Click to collapse
What? I mean, my carrier has the HSPA+ 21Mbps/42Mbps it supports... What do you mean by it not supporting WCDMA?
Sent from Samsung Galaxy Nexus @ CM11

AndyYan said:
What? I mean, my carrier has the HSPA+ 21Mbps/42Mbps it supports... What do you mean by it not supporting WCDMA?
Sent from Samsung Galaxy Nexus @ CM11
Click to expand...
Click to collapse
If I understand correctly, the network mode menu option for WCDMA in the CM10 ROM is left over from the D2, which is a phone of similar spec which our developers based our ROM on. It doesn't do anything on the Relay.

Jax184 said:
If I understand correctly, the network mode menu option for WCDMA in the CM10 ROM is left over from the D2, which is a phone of similar spec which our developers based our ROM on. It doesn't do anything on the Relay.
Click to expand...
Click to collapse
But it DOES switch network modes... Or so I think, judging from the symptoms.
The first SIM only supports WCDMA(HSPA+), and when inserted, it can find my carrier's network but can't connect. On the second SIM which is compatible with both GSM/WCDMA, I lose signal only when "WCDMA only" is chosen, and under this situation the symptom is same as above. I assume that it can find my carrier's GSM network but not the WCDMA one.
Sent from Samsung Galaxy Nexus @ CM11

Bump in vain. I guess I'll be selling this phone if the issue is really within the phone itself...
Sent from Samsung Galaxy Nexus @ CM11

Z3 Dual D6633 SIM compatibility / issues

Hi, I've got a Z3 dual D6633 which I want to use with an EE SIM in the UK. I've tried a cut down microsim and been into the EE shop and tried one of their nano SIMs but both don't work correctly in the phone.
The cut down SIM makes a service phone.android.com or something like that continually crash and doesn't connect to the network.
The one I tried in the shop just doesn't connect to the network.
This is on 23.0.F.1.74 and .82 I noticed in the release notes for .82a fix for Yoga SIMs in Russia but don't know what the problem there was, but wonder if it is linked. All other UK Sims work including 3, Lyca, giffgaff, Vodafone, virgin just not EE. has anyone got an EE one working or had similar problems?
I did notice that an app/widget I use called phono to show network info and signal strength usually shows the IMEI when no SIM inserted or the MSISDN, however with the non-working EE SIM it just shows 00000 - not sure which field it is getting wrong. Oh and yes the SIMs work fine in all other phones I've tried.
I do need to try more tests on factory reset and removing phono etc but so far it looks to be a firmware incompatibility with EE Sims.

OK, so I did a few more tests and got hold of another nano SIM on EE.
So it looks like the 23.0.F.1.74 firmware does not like EE SIMs and the phone application constantly crashes. On the later .82 firmware it works fine. I was mislead a bit by going into an EE store and trying a SIM - they must have given me an un-provisioned SIM to try. I stupidly assumed they would have actually given me a SIM that worked, doh!

I'm experiencing something similar here. I have the D6633, bought in UK, now I am in Brazil and the phone works great except that it won't connect to the 4G/3G/2G/LTE network. I can make calls, send sms normal. But internet only over wi-fi.
I called my operator, they say the phone is configured correctly, I tried my brother's sim card from another operator and the same happens.
So, the phone is clearly unlocked, if not it wouldn't recognize the sim cards at all. But no connection to the internet...
Any suggestions? I already did four factory resets, I recovered the Rom using sony software...

Same issue
adrenalize_ said:
OK, so I did a few more tests and got hold of another nano SIM on EE.
So it looks like the 23.0.F.1.74 firmware does not like EE SIMs and the phone application constantly crashes. On the later .82 firmware it works fine. I was mislead a bit by going into an EE store and trying a SIM - they must have given me an un-provisioned SIM to try. I stupidly assumed they would have actually given me a SIM that worked, doh!
Click to expand...
Click to collapse
Hello, I have the exact same problem. How did you get the firmware .82/for what country? Is everything working well with it? Really appreciate your guidance.

I had the same problem with the EE sim card, ended up sending the phone back.

fabiooli said:
I'm experiencing something similar here. I have the D6633, bought in UK, now I am in Brazil and the phone works great except that it won't connect to the 4G/3G/2G/LTE network. I can make calls, send sms normal. But internet only over wi-fi.
I called my operator, they say the phone is configured correctly, I tried my brother's sim card from another operator and the same happens.
So, the phone is clearly unlocked, if not it wouldn't recognize the sim cards at all. But no connection to the internet...
Any suggestions? I already did four factory resets, I recovered the Rom using sony software...
Click to expand...
Click to collapse
Just a thought, but is it definitely a 6633 and not some other variant which perhaps doesn't work in your country/network?

pconcha said:
Hello, I have the exact same problem. How did you get the firmware .82/for what country? Is everything working well with it? Really appreciate your guidance.
Click to expand...
Click to collapse
I purchased my D6633 from Saudi Arabia and the 23.0.F.1.82 update came as an OTA notification about a week ago.
If you look in this thread http://forum.xda-developers.com/z3/general/d6633-z3-dual-updated-to-23-0-f-1-82-t2929352/ it mentions that someone thinks the update has only been released for Saudi and Brazil - I assume it is for Europe as well as one of the release notes says a problem with Russian Yota SIMs has been fixed. I think there are also links to the firmware in there although I've not looked that hard as I got the OTA. I guess it might still in my memory - anyone know where Sony stick their OTAs?
Seems to work fine so far - no noticeable difference - well other than EE SIMs now work!

jadaress1 said:
I had the same problem with the EE sim card, ended up sending the phone back.
Click to expand...
Click to collapse
Ah, shame as it looks like the update might have fixed it. I was thinking I might have to go to another handset too (The Samsung G900FD is OK if you can put up with touchwiz and other Samsung "features"!!)

fabiooli said:
I'm experiencing something similar here. I have the D6633, bought in UK, now I am in Brazil and the phone works great except that it won't connect to the 4G/3G/2G/LTE network. I can make calls, send sms normal. But internet only over wi-fi.
I called my operator, they say the phone is configured correctly, I tried my brother's sim card from another operator and the same happens.
So, the phone is clearly unlocked, if not it wouldn't recognize the sim cards at all. But no connection to the internet...
Any suggestions? I already did four factory resets, I recovered the Rom using sony software...
Click to expand...
Click to collapse
Hmmm, sounds like another issue as with mine the EE SIM caused the phone.apk to constantly crash/restart.
Did the data work OK in the UK?
As you can make calls/SMS I assume you are at least on a 2G network which should still give you (very slooow) data - It does sound more like an APN issue - or something else. I know you said you checked with your operator what their APN settings should be (just my experience with operator customer support lines) - but I would try and have a look yourself - and maybe list your APN settings and operator and someone may spot something.
I have seen a couple of phones / operators where the "APN type" in the APN settings needs specific settings - its down the bottom and often isn't mentioned when people get the settings. For example in my current settings I have "default,hipri,dun,supl" for Virgin mobile in the UK.
You may want to search XDA/Google or start your own thread which might get more reads/replies

adrenalize_ said:
You may want to search XDA/Google or start your own thread which might get more reads/replies
Click to expand...
Click to collapse
...or try some of the things which have already been suggested and post your findings !

adrenalize_ said:
Hmmm, sounds like another issue as with mine the EE SIM caused the phone.apk to constantly crash/restart.
Did the data work OK in the UK?
As you can make calls/SMS I assume you are at least on a 2G network which should still give you (very slooow) data - It does sound more like an APN issue - or something else. I know you said you checked with your operator what their APN settings should be (just my experience with operator customer support lines) - but I would try and have a look yourself - and maybe list your APN settings and operator and someone may spot something.
I have seen a couple of phones / operators where the "APN type" in the APN settings needs specific settings - its down the bottom and often isn't mentioned when people get the settings. For example in my current settings I have "default,hipri,dun,supl" for Virgin mobile in the UK.
You may want to search XDA/Google or start your own thread which might get more reads/replies
Click to expand...
Click to collapse
It was working fine there. Here It apparently could not download APN settings, so I installed an APN APP and now it works fine!!!
---------- Post added at 12:36 PM ---------- Previous post was at 12:30 PM ----------
poldie said:
Just a thought, but is it definitely a 6633 and not some other variant which perhaps doesn't work in your country/network?
Click to expand...
Click to collapse
Working great now!!!! I used an APN APP form PlayStore

adrenalize_ said:
I purchased my D6633 from Saudi Arabia and the 23.0.F.1.82 update came as an OTA notification about a week ago.
If you look in this thread http://forum.xda-developers.com/z3/general/d6633-z3-dual-updated-to-23-0-f-1-82-t2929352/ it mentions that someone thinks the update has only been released for Saudi and Brazil - I assume it is for Europe as well as one of the release notes says a problem with Russian Yota SIMs has been fixed. I think there are also links to the firmware in there although I've not looked that hard as I got the OTA. I guess it might still in my memory - anyone know where Sony stick their OTAs?
Seems to work fine so far - no noticeable difference - well other than EE SIMs now work!
Click to expand...
Click to collapse
I see. Mine is the d6633 but it is customized for HK. I have not received the OTA upgrade yet. I have checked xperifirm as they may have it but will wait for the OTA upgrade. Sony must be releasing soon.
Thank you for replying! I am using Vodafone in the meantime, but want to go back to my EE plan!

about dual sim connectivity
can anyone tell me which sim card slot support 2G, 3G and 4G or LTE
I heard that 1 slot support only 3G and 4G
and other one is support 2G & 3G so kindly confirm me what is actual.
thanks

arfan.chatha said:
can anyone tell me which sim card slot support 2G, 3G and 4G or LTE
I heard that 1 slot support only 3G and 4G
and other one is support 2G & 3G so kindly confirm me what is actual.
thanks
Click to expand...
Click to collapse
For mine, on my networks here in Australia, I can assign 4G LTE to any sim, however, that makes the other sim 2G only (GSM).
The other option is to have both at 3G (WCDMA/HSPA).

If you assign 4g to sim one that work only for 4g or like other phones "LTE(preference)/WCDMA/GSM"
4g not available automatically search 3G if 3G not available automatically search 2G?
Assume second sim is on 2g

arfan.chatha said:
If you assign 4g to sim one that work only for 4g or like other phones "LTE(preference)/WCDMA/GSM"
4g not available automatically search 3G if 3G not available automatically search 2G?
Assume second sim is on 2g
Click to expand...
Click to collapse
Yes, your 4G sim slot will fall back onto 3G and 2G as per expected for most handsets.

help needed
sephstyler said:
For mine, on my networks here in Australia, I can assign 4G LTE to any sim, however, that makes the other sim 2G only (GSM).
The other option is to have both at 3G (WCDMA/HSPA).
Click to expand...
Click to collapse
I just got a 6633 through kogan and i am having real trouble getting it to connect to optus network with iinet and truphone simcards. Does anyone know if i need to update any settings or firmware from factory to make it compatible. I can see iinet and truphone lte networks (which i assume is the optus 4g network) when searching manually but the phone wont connect. Sims work in a mates iphone6 without a problem.

Don't suppose anyone knows how to get rid of the #sim card icon on the statusbar?

adrenalize_ said:
I purchased my D6633 from Saudi Arabia and the 23.0.F.1.82 update came as an OTA notification about a week ago.
If you look in this thread http://forum.xda-developers.com/z3/general/d6633-z3-dual-updated-to-23-0-f-1-82-t2929352/ it mentions that someone thinks the update has only been released for Saudi and Brazil - I assume it is for Europe as well as one of the release notes says a problem with Russian Yota SIMs has been fixed. I think there are also links to the firmware in there although I've not looked that hard as I got the OTA. I guess it might still in my memory - anyone know where Sony stick their OTAs?
Seems to work fine so far - no noticeable difference - well other than EE SIMs now work!
Click to expand...
Click to collapse
Have you managed to root it? I rooted the 23.0.1.f.0.96 firmware for my Z3 D6633, but after a while (half a day) it starts to reboot frequently, and Google Play stops working (can browse apps, but not download them, as the download bar never progresses).
Also, my EE sim seems to work, but the phone still shows it as 'Sim 1 0000000' whereas other sims simply appear as sim 1 and sim 2.
I am wondering if I should just downgrade back to 23.0.F.1.74 and move from EE to Vodafone or 3...

Ah, work forced a BlackBerry (yuck!) on me and I've since sold the D6633.

[HOW-TO] Fix LTE for International Model Note 3 (USA Carrier)

So something weird has been happening since purchasing my mint conditioned note 3 on Sprint. Every time I was inside my home, my note 3 would lose LTE and stay on 3g. I was looking for answers and not finding a single thing. I came up with a solution myself and here is where the explaining begins. Be careful when purchasing a phone online as some are international phones (which we know). I happened to purchase an n900p note 3 model and it was actually made in China but my signal radios were set to Japan. If you are in the USA and using Sprint then do the following:
-Download from the play store an app called Samsung phone info
-After the install is complete open the app and open the menu on the left side
-Select Secret Codes
-Scroll down to settings and select Launch 0
-Choose Phone Information
-In the upper right hand corner there are 3 dots, choose radio baseband and select USA from Japan
-Enjoy LTE
Sent from my Note 3 using XDA Free mobile app

i am trying to use a n900p (sprint) unlocked phone with a gsm carrier in india.
in the *#0011# dialer menu it shows imei certi fail.
i have been searching for the 'imei certi fail -9' fix.
i searched on google but couldnt find a satisfying perfect solution.
will appreciate any help possible.
thanks.

aaki_rocker said:
i am trying to use a n900p (sprint) unlocked phone with a gsm carrier in india.
in the *#0011# dialer menu it shows imei certi fail.
i have been searching for the 'imei certi fail -9' fix.
i searched on google but couldnt find a satisfying perfect solution.
will appreciate any help possible.
thanks.
Click to expand...
Click to collapse
Are you rooted? Or on the default ROM for your device? The problem could be sprint uses CDMA not GSM, GSM is for devices without sim cards but I think is used on sprint for the sole purpose of emergency calls
Sent from my Note 3 using XDA Free mobile app

aaki_rocker said:
i am trying to use a n900p (sprint) unlocked phone with a gsm carrier in india.
in the *#0011# dialer menu it shows imei certi fail.
i have been searching for the 'imei certi fail -9' fix.
i searched on google but couldnt find a satisfying perfect solution.
will appreciate any help possible.
thanks.
Click to expand...
Click to collapse
But do you still have IMEI and Baseband version?
(look for the Baseband version and IMEI in the Phone INFO app).

ebs512 said:
Are you rooted? Or on the default ROM for your device? The problem could be sprint uses CDMA not GSM, GSM is for devices without sim cards but I think is used on sprint for the sole purpose of emergency calls
Sent from my Note 3 using XDA Free mobile app
Click to expand...
Click to collapse
the phone is rooted and running close to stock tw 4.4.4 rom.
true that sprint is a cdma carrier. but the n900p has all the gsm basebands which my carrier provides.
also phone has been internationally unlocked using sprint unlocker. (ssu.apk.)
vndnguyen said:
But do you still have IMEI and Baseband version?
(look for the Baseband version and IMEI in the Phone INFO app).
Click to expand...
Click to collapse
baseband is nk4 and my imei number is shown which starts from 99.
so i think everything is pretty normal here.
i am just concerned about the phone not activating and it refuses to register to any network. i've tried 3 different indian carrier sim cards.

aaki_rocker said:
the phone is rooted and running close to stock tw 4.4.4 rom.
true that sprint is a cdma carrier. but the n900p has all the gsm basebands which my carrier provides.
also phone has been internationally unlocked using sprint unlocker. (ssu.apk.)
baseband is nk4 and my imei number is shown which starts from 99.
so i think everything is pretty normal here.
i am just concerned about the phone not activating and it refuses to register to any network. i've tried 3 different indian carrier sim cards.
Click to expand...
Click to collapse
The phone might not be compatible with that specific carrier or you might have to take your sim card to the carrier and have them activate it but who knows.I took mine to Sprint and the guy asked me where I got the phone, I told him online. The problem with me having a Japan radio baseband set as default my LTE signal gets lost when I go in a building but when I'm outside, it picks back up again. If I switch the radio to USA I get 4g but then can't send/receive MMS. After a period of time on the USA baseband, it will completely lose signal and show up a black empty service in my status bar
Sent from my Note 3 using XDA Free mobile app

ebs512 said:
The phone might not be compatible with that specific carrier or you might have to take your sim card to the carrier and have them activate it but who knows.I took mine to Sprint and the guy asked me where I got the phone, I told him online. The problem with me having a Japan radio baseband set as default my LTE signal gets lost when I go in a building but when I'm outside, it picks back up again. If I switch the radio to USA I get 4g but then can't send/receive MMS. After a period of time on the USA baseband, it will completely lose signal and show up a black empty service in my status bar
Sent from my Note 3 using XDA Free mobile app
Click to expand...
Click to collapse
is there any permanent solution to get a signal ?

aaki_rocker said:
is there any permanent solution to get a signal ?
Click to expand...
Click to collapse
Not if the sim card isn't working I would contact the carrier and see if they can get your sim card entered properly for service to your device
Sent from my Note 3 using XDA Free mobile app

4G LTE on Sony Xperia XZ from the UK in US?

I'm not getting LTE on my Sony Xperia XZ with AT&T. I'm in the U.S but got the UK version from Clove UK because of the lower price and freebies with the preorder. The US and UK Sony Xperia XZ are the same model number and the whitepaper has all of AT&T bands. Both are F8331 meaning there is only one Single SIM version. However the most I get is HPSA (3G?). Calls work fine and voice is very clear and I get full bars, however I can't get LTE anywhere. My friend that is on AT&T and has an iPhone 6S gets LTE with no problem.
I'm thinking that it has to do with the LTE bands being disabled or because it is a UK phone. I understand not getting Wifi-Calling or VoLTE because I didnt get the phone from AT&T but rather unlocked. But I should be able to get LTE, I might be wrong though. Could I possibly get the problem fixed by flashing the phone to a U.S firmware maybe? If anyone could help I would appreciate it.

Got the same phone from Clove on AT&T and LTE is no problem. The issue is most likely IMEI related. I have been using Xperia devices on AT&T for years and this has given me issues in the past. IMEI numbers are recycled and since Sony phones are not carrier issued their IMEI numbers are not loaded in AT&T's database. It most likely is linked to a 2G or 3G device from years past. Give AT&T an IMEI number from an AT&T LTE phone and you will access LTE. Also check APN to see if it's correct.
Sent from my F8331 using XDA-Developers mobile app

Yes don't flash the US Firmware, you won't get the fingerprint scanner, I bought the US version of the phone and Flashed the UK version, instead of LTE now shows 4G but is the same just different nomenclature

I can't speak for other countries, but the Singapore firmware reports as LTE on AT&T. But, it doesn't work until you go to Settings -> More -> Internet Settings and let it download.
Then, if you go to Settings -> More -> Mobile Networks, you should see the different AT&T APN's.

augie7107 said:
Got the same phone from Clove on AT&T and LTE is no problem. The issue is most likely IMEI related. I have been using Xperia devices on AT&T for years and this has given me issues in the past. IMEI numbers are recycled and since Sony phones are not carrier issued their IMEI numbers are not loaded in AT&T's database. It most likely is linked to a 2G or 3G device from years past. Give AT&T an IMEI number from an AT&T LTE phone and you will access LTE. Also check APN to see if it's correct.
Sent from my F8331 using XDA-Developers mobile app
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Click to collapse
A million thanks. Everything you said was spot on. The IMEI as you said was not loaded into the AT&T database since the IMEI for my Xperia XZ is 14 digits vs 15 for an AT&T phone. I asked a friend for his IMEI and went to an AT&T store and did what you told and now I have LTE! Of course it appears as 4G on my Xperia but it's still LTE. Again thanks for your help.

peltruquin said:
Yes don't flash the US Firmware, you won't get the fingerprint scanner, I bought the US version of the phone and Flashed the UK version, instead of LTE now shows 4G but is the same just different nomenclature
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Thanks for your help also. I figured that flashing the US firmware would disable the fingerprint scanner. My phone now shows 4G after I tried the solution to the first reply. Good to know it's the same as LTE. I don't regret buying the phone from the UK bc everything is working out fine.

twinkie said:
I can't speak for other countries, but the Singapore firmware reports as LTE on AT&T. But, it doesn't work until you go to Settings -> More -> Internet Settings and let it download.
Then, if you go to Settings -> More -> Mobile Networks, you should see the different AT&T APN's.
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I tried what you suggested but it still shows 4G. The options are still the same. Apparently it is the same as LTE just shows up as 4G. Thanks though for the idea. It was worth a try.

In the UK LTE bandwidth is marketed as 4g.
You've purchased a UK Sony with UK firmware hence you will see a 4g symbol rather then LTE.

rmadrid7 said:
A million thanks. Everything you said was spot on. The IMEI as you said was not loaded into the AT&T database since the IMEI for my Xperia XZ is 14 digits vs 15 for an AT&T phone. I asked a friend for his IMEI and went to an AT&T store and did what you told and now I have LTE! Of course it appears as 4G on my Xperia but it's still LTE. Again thanks for your help.
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My pleasure
Sent from my F8331 using XDA-Developers mobile app

peltruquin said:
Yes don't flash the US Firmware, you won't get the fingerprint scanner, I bought the US version of the phone and Flashed the UK version, instead of LTE now shows 4G but is the same just different nomenclature
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How did you succed to flash without loader.sin for F83xx ?

enrique71 said:
How did you succed to flash without loader.sin for F83xx ?
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Not sure what you are asking for, but I just followed the instructions from other post don't have the link at the moment, install xperifirm select the uk rom and it creates the ftf file for you, no need to worry about removing the xml file, I even forgot to put the phone on debugging mode it failed at first then I retried and it worked

peltruquin said:
Not sure what you are asking for, but I just followed the instructions from other post don't have the link at the moment, install xperifirm select the uk rom and it creates the ftf file for you, no need to worry about removing the xml file, I even forgot to put the phone on debugging mode it failed at first then I retried and it worked
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Thanks, I figured it out. Appreciate the response. :good:

Thanks! That makes sense. Is there a way to test the speed? And so you are saying 4G is LTE, is that right? My XZ Premium, also from Clove, now says 4G so I should be good to go, right?