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I bought a house and moved.
No service in the house with Verizon.
So, I switched to AT&T.
AT&T told me I would get HSPA+ with my Verizon S3.
Well... I have 2G, voice, and text.
Anyone have an idea of how to get HSPA+ enabled? Is it possible?
I have a custom ROM, but I can flash anything if it would help.
I don't think it's possible, they run on completely different networks (CDMA Vs GSM) and the phones radios are built accordingly.
Sent from my SCH-I535 using xda app-developers app
I'm leaning toward that. Guess I'll upgrade....
Verizon to AT&T and SIM unlock with NO codes
draexo said:
I'm leaning toward that. Guess I'll upgrade....
Click to expand...
Click to collapse
There is a way cant remember where i read it, maybe on the t-mobile forum. I recently bricked my att device and came across a verizon variant and was able to use it for att with out having it sim unlocked just a few hours ago steps taken were as follows:
After swapping the motherboards i factory reset the non rooted verizon device from the settings menu as I was just going to sell it on ebay. I had been using wifi only on a sim locked t-mobile device but the camera was not working so i switched back to the verizon and was prompted to complete the set up after i booted the device with no sim card inside. I got the no sim card message and ran the app Region Lock Away that has a red circle icon and a black unlocked pad lock by chainfire. I was skeptical 1 for the device not being rooted but tried anyway. The app said it was not able to verfiy root and closed; however once I inserted my att sim card without powering off the device i saw signal bars. Now Im not sure the app actually did anything and I might have tried the app before resetting it without success but after checking the network mode in the mobile networks tab it now shows Global as the preferred network. So i started texting people and then calling all with success. Now im still on the edge network and this may not solve your issue but I remember seeing the work around I think it has to do with correcting the APN settings but there is always a way to get things done. Keep looking you will find it. Im just happy to have cell service again but Ill be looking for the thread in a day or so as well.
Forced into an AT&T phone. It worked for 4 days then stopped. Their tech support claims the tap wasn't compatible and they don't know why it worked
I had 2g for those 4 days
I'm always on wifi but noticed my data wasn't working so not an ideal switch but if you are in a bind it does work. I'm still running at&t network on this Verizon motherboard just fine
Sent from my SCH-I535 using XDA Premium 4 mobile app
I don't know what happened but all inbound calls on day 4 went direct to voicemail. I reset phone, flashed different ROM.... Nothing
Starting this October, PagePlus is offering 4G/LTE. Initially, I was assuming that all I need to do is plug in an LTE SIM card and activate account, and all will be peachy. However, it seems that by flashing phone to pageplus when it looks like a 3g device, I have messed up some radio settings, and verizon provisioning doesn't work, phone repeatedly keeps trying to call *228. Contrary to that, the other S3, which I didn't flash does not call at all, but instead pops up message box stating that the phone is being programmed, and after a couple minutes it's online . I do not remember what exactly did I program, it was awhile ago . Pageplus support knows that problem, and they are advising anybody who wants to go LTE to bring up an unflashed phone, saying the flashed one won't work
There are folks on kitty forums who offer remote de-flashing for 30 bucks, but no description what actually they do. Does anyone know what the process is? I can get my phone into QPST/DFS. Anyone knows what to do next?
UPDATE: see post #3 for solution
Can't help you with deflashing, but I will tell you that my local page plus vendor did mine for free and it only took him about 5-10 minutes. Maybe yours would do the same. Just a thought.
Sent from my SCH-I535 using Tapatalk
I guess it indeed is simple once you get to QPST mode. I used DFS to program, and the only setting I had to change was RuimConfig = RuimOnly (from NV_ONLY), see screenshot attached. Did not work on 4.0 firmware which I tried to use first, but worked fine on 4.2.1 and 4.1.2.
I got a sim card for my phone. All I did was verify that my phone was on RuimOnly (it already was), then I contacted PagePlus to activate my simcard (you're supposed to do this before you put it in your phone, they say) and they remotely programmed the phone, everything went smoothly. I have 4g data now, no "unflashing" required. Pretty easy. :good:
You put it on your phone before, you want this set up, then you can use the phone, so no problem.
Confirmed
I can confirm this works. I switched 2 samsung galaxy note 2 SCH-i605 from 3g to 4g.
The phones were originally flashed over to pageplus using wireless workshop. This puts them on pageplus as 3g phones. They drop the last digit of the MEID so it is a 14 digit code (3g) instead of 15 digit for 4G.
Here's what I did to get 4G LTE working.
Ordered a pageplus SIM card from pageplus
put the simcard in the phone
Used DFS to change RUIM from NV_Only to RUIM_only
Contacted Pageplus on chat and had them change my phone from 3g to 4g. I'm not sure exactly what they did, but I gave them the 15 digit MEID and the SIM ICCID (printed on the sim card you get, or look in settings, about device, details or something like that, you know where to look. ) The customer service rep said that what you need to tell them is you want to change a 3g phone to 4g. I told them it was back to standard firmware just to make them happy. It seems the RUIM changes is all you need.
Voila! Reboot the phone, give it a minute - it connects to 4G and then disconnects and looks like it has failed, but give it a minute and it comes up with 4G LTE and speedtest.net confirms it is blazing fast.
Loving it!
This is only required for a verizon phone that has been flashed in the past to make 3g work on Pageplus. Not needed on contract phones from verizon that are originally 4g.
Happy downloading!
galets said:
I guess it indeed is simple once you get to QPST mode. I used DFS to program, and the only setting I had to change was RuimConfig = RuimOnly (from NV_ONLY), see screenshot attached. Did not work on 4.0 firmware which I tried to use first, but worked fine on 4.2.1 and 4.1.2.[/QUOTE I did that but i do not have 4g and imwe in a 4g coverage area. using a mxx xt912. any help is appreciated
Click to expand...
Click to collapse
Gift for a friend
hi everyone,
I have a few questions based on my circumstances. I just deactivated a S3 Verizon from PagePlus which was flashed to 3g. I would like to hand my phone off to a friend as he's running a Droid X (!).
1. From what I understand to "unflash" I need to use DFS (cdmatool.com) and set Ruim config to RuimOnly. However, I believe the phone needs to be in QPST mode? I'm not entirely sure how to do this. Can someone point me in the right direction?
2. Since I already deactivated the phone, when my friend tries to re-activate on pageplus (with a new SIM), do we need to contact PP and tell them this device is now 4g?
3. Does it matter that I have a custom ROM running 4.3? I don't think so, but would like confirmation.
I really don't want to mess up this gift.
Thanks for any and all advice!
Dapeche said:
1. From what I understand to "unflash" I need to use DFS (cdmatool.com) and set Ruim config to RuimOnly. However, I believe the phone needs to be in QPST mode? I'm not entirely sure how to do this. Can someone point me in the right direction?
Click to expand...
Click to collapse
In general, this is done via USBSettings dialog, see if this thread helps you to get this menu enabled: http://forum.xda-developers.com/showthread.php?t=2227576
I have a i605 currently flashed to page plus 3g can't write with dfs without spec and I can't seem to get it can anybody point me in the right direction
I'm dumb figured it all out except page plus they keep saying I have to go to a dealer I said I am no longer flash but they keep telling to have a dealer manually flash it.....?
Update got everything working once I was in ruim only I called them at told them I had two phones and gave them the full imied as my second phone then the iccid and voila activation was a breeze
This is a repost from this I had to do it beacuse the forum system would not let me respond to my own threat as i created it anonymously. Sorry for the inconvenience but i have not been able to do it.
Edit: MAN i forgot to add the title, now i feel dumb!
Hi everyone.
Last time i was in xda forums was when i try to mod my windows mobile CE 5.0 lol
This is my sad story:
I bought in the US a samsung s7 with T-Mobile SM-G930T, i paid a guy who 'unlocked' it in there. After that i brought it to Colombia, in here i run the T-mobile unlock app which succeded and erased itself after that. Then the cellphone started working with all the mobile companies in my country except for one that operates over 1800 mhz, other companies do work fine. When i insert a simcard of this company it just says that 'Not registered in network' and wont do nothing. I already tried to put the APN settings correctly (Actually it automatically loaded every company settings detected).
After that i tried to root with a modded Odin with a custom ROM and it succeeded and i got the SuperSU application, tho the cellphone its a little laggy now, but neither that way it worked. Anyone knows how where should i start looking?
I went to this company support and they sent me to Samsung support, which redirected me back to this company, lol
Thanks in advance guys
Update:
I have entered the service mode and enabled just the bands i need, also all the bands both in GSM and LTE but could not get it working
Also i tried to find the HiddenMenu file on /efs/carrier but its just not there.
Icaro91 said:
This is a repost from this I had to do it beacuse the forum system would not let me respond to my own threat as i created it anonymously. Sorry for the inconvenience but i have not been able to do it.
Edit: MAN i forgot to add the title, now i feel dumb!
Hi everyone.
Last time i was in xda forums was when i try to mod my windows mobile CE 5.0 lol
This is my sad story:
I bought in the US a samsung s7 with T-Mobile SM-G930T, i paid a guy who 'unlocked' it in there. After that i brought it to Colombia, in here i run the T-mobile unlock app which succeded and erased itself after that. Then the cellphone started working with all the mobile companies in my country except for one that operates over 1800 mhz, other companies do work fine. When i insert a simcard of this company it just says that 'Not registered in network' and wont do nothing. I already tried to put the APN settings correctly (Actually it automatically loaded every company settings detected).
After that i tried to root with a modded Odin with a custom ROM and it succeeded and i got the SuperSU application, tho the cellphone its a little laggy now, but neither that way it worked. Anyone knows how where should i start looking?
I went to this company support and they sent me to Samsung support, which redirected me back to this company, lol
Thanks in advance guys
Update:
I have entered the service mode and enabled just the bands i need, also all the bands both in GSM and LTE but could not get it working
Also i tried to find the HiddenMenu file on /efs/carrier but its just not there.
Click to expand...
Click to collapse
Hey,
You can continue posting it there in your thread itself.
I am closing this thread as another member already tried to help you out there. Please respond and continue the further discussion there itself.
Regards
Vatsal,
Forum Moderator.
I have a SM-G955N Korean model I bought from eBay. Everything works except Mobile Data. I call ATT (my service) got connected with their Advance Division, and they not did help.
We tried setup a new connect under Access Point Names with no luck. I did notice that more ATT type APNs did add to the list of APNs, I tried each and powered off the phone each time, no luck.
My Wi-Fi works just not the Mobile Data. I typed in the Service Mode code which I got from another thread *#2683662#,(thanks XDA Developers), what I got looks like this:
MAIN MENU
[1] Protocol
[2] UE Setting & Information
[3] ETC
MOBILE: null
MOBILE_IMS: null
When I access The 1,2,3 pages I always get the MOBILE: null and MOBILE_IMS: null at the bottom of every page. My guess these are error codes.
Any help or ideas would be great.
Thank you.
Same here with 955n, null also but I have mobile data running. Lte it says instead of 4g i had on my 955f.
Sent from my SM-G955N using Tapatalk
---------- Post added at 06:34 PM ---------- Previous post was at 06:32 PM ----------
Lte instead of 4ghttp://cloud.tapatalk.com/s/5925d2414e052/Screenshot_20170524-213318.png?
Sent from my SM-G955N using Tapatalk
So yours works, Mobile Data, but you are seeing the MOBILE: null and MOBILE_IMS: null Both or just one?
I read that the seller of a Korean phone has to start it up with a Korean sim card and make a call for 5 minutes or the phone will not work out of their country.
I wonder if this is what happens? No Mobile Data connection.
same for EU phones - if you bought from EU you'd have to 'unlock' it first with an EU sim else it won't work
This guy can help:
Look at this on eBay http://www.ebay.com/itm/322518132661
He switched my S8+ from Tracfone to T-Mobile with all bands working w/ 4G LTE to the point one can't even tell this phone belonged to a different carrier than T-Mobile.
P.S. I had the same issue to where I could connect & surf the Internet with 4G but I was unable to make calls/texts. After he did his magic, which was remotely by the way, my phone got a new life. I bought his service four days ago and my phone is working phenomenally well so far. Give it a try guys.
Does anyone know of a way to unlock the T-Mobile bands on this phone? - the SM-G955N, Can it be done?
There are no clickable options when I access the service menu.
skyprotocol99 said:
Does anyone know of a way to unlock the T-Mobile bands on this phone? - the SM-G955N, Can it be done?
There are no clickable options when I access the service menu.
Click to expand...
Click to collapse
Try Doctorsim
State.of.mind said:
Try Doctorsim
Click to expand...
Click to collapse
Thank you for the recommendation, I'm glad I tried this.
Unfortunately, they DoctorSim was unable to help me as my phone is on the t-moblie network but is not prompting an unlock code.
When I enter this code
*#2683662#
ServiceMode
Not supported
Mobile: null
Mobile_IMS: null
skyprotocol99 said:
Thank you for the recommendation, I'm glad I tried this.
Unfortunately, they DoctorSim was unable to help me as my phone is on the t-moblie network but is not prompting an unlock code.
When I enter this code
*#2683662#
ServiceMode
Not supported
Mobile: null
Mobile_IMS: null
Click to expand...
Click to collapse
No problem. Hmm maybe you will have to do it through T Mobile? I recall that Doctorsim took a long time to work, but it was guaranteed for the phone to be unlocked. Also, did you purchase the premium?
Try
Support.t-mobile.com/docs/DOC-27772
---------- Post added at 03:14 PM ---------- Previous post was at 03:09 PM ----------
On second thought maybe it cannot be done. I pulled this from a previous XDA thread. Source: https://forum.xda-developers.com/galaxy-s8+/help/ive-korean-model-s8-questions-t3590720
"*Since September 2013, Samsung has implemented a 'region lock' on all new stock.
For correct operation, this handset should be activated inside one of these countries with a SIM card issued for use there. The device will then be able to accept SIM cards from outside of these countries.
Activation requires turning the device on for the first time & completing set-up with the SIM installed, then completing at least 5 minutes of voice call(s) with this SIM.
Without activation you may still use the device outside of these countries when 'roaming' - using a SIM card from the listed countries.
If this activation procedure is not followed then the device will lock when first attempted to be used with a SIM card from outside of these regions. Local Samsung support may provide a code to unlock such handsets.
**All member states of the E.E.A and the following additional territories: Albania, Andorra, Bosnia and Herzegovina, Former Yugoslav Republic of Macedonia (F.Y.R.O.M), Monaco, Montenegro, San Marino, Serbia and Vatican City.
From what i understand you might need a sim from Korea to activate it once activated it will work worldwide with any sim card. i could be wrong but that’s how i think it works!"
Another user stated that "Confirmed I had to have my SM-955N unlocked and used in Korea before shipping. Also have the KT logo. Back is actually less busy than other versions without all the FCC, CE etc logos."
Thanks for the help with this!
I am considering mailing the phone to Korea to have someone there do the sim card activation.
But before I do this I want to make sure I understand the lock issue.
The phone does not actually give me a "LOCKED" message, and it partially works T-Mobile, it just does not pickup all the LTE bands, so it only has a connection about 50% of the time. Tmobile recently changed their bands, a month and a half ago it was working perfectly. The main goal is to turn on the locked bands.
If I'm understanding correctly if I take the phone to Korea, use a sim card from there on it, and make calls, then I go back to T-Mobile it will trigger the unlock mesage, which will allow me to access the LTE bands in *#2683662#??
Have you solved this yet?
skyprotocol99 said:
Thanks for the help with this!
I am considering mailing the phone to Korea to have someone there do the sim card activation.
But before I do this I want to make sure I understand the lock issue.
The phone does not actually give me a "LOCKED" message, and it partially works T-Mobile, it just does not pickup all the LTE bands, so it only has a connection about 50% of the time. Tmobile recently changed their bands, a month and a half ago it was working perfectly. The main goal is to turn on the locked bands.
If I'm understanding correctly if I take the phone to Korea, use a sim card from there on it, and make calls, then I go back to T-Mobile it will trigger the unlock mesage, which will allow me to access the LTE bands in *#2683662#??
Click to expand...
Click to collapse
Just curious if you found a solution to this yet?
I read all the posts about how a phone branded and bought in Korea needs to be on a Korean simcard for at least 5 min or so before it will accept any other (non-Korean) simcards.
So since I was based in Korea I bought the S8+ (SM-G955N - 128GB/6GB version) in Korea as soon as it was launched in April 2017 and used it with my Korean telecom provider (KT Telecom) for over half a year. In that period, while travelling outside Korea, roaming on LTE in different countries was never a problem.
Recently, I have moved from Korea (to Europe) and got a local simcard (Vodafone - NL). I can get on my provider's network, receive/send calls/sms, etc. No problem, but no LTE! Only some 3G/Edge!
I tried the 'service menu' with *#2683662#, access is possible but it gave back the same:
ServiceMode
Not supported
Mobile: null
Mobile_IMS: null
So first I thought it was related to KT Telecom how their GiGA LTE technology is somehow dependent on the use of a KT Telecom simcard with the KT Telecom network and basically without the KT Telecom simcard, basic LTE functionality would stop.
So I am reading through the different internet forums and advice from other users, but as far as I can tell, I don't think there is any other solution for me then to flash my phone with a less 'Korean-ized' stock firmware and hope this will resolve my problem.
Since, technically my phone is still under warranty, I am a bit taken back with all the extensive 'liability waivers' and step-by-step instructions. Rooting and flashing my phone is my last resort option.
I am just wondering if there are any other SM-G955N users out there who encountered the same problem and made some progress in any other way. Any feedback or comment is mostly appreciated.
I picked up a Korean G930S that had Chinese CSC, and I put an F ROM onto it. The CSC did not change. Here in the US the Chinese CSC worked just fine on the AT&T service getting 4G/LTE. I flashed an XAA CSC (probably not the correct one now that I think about it), which would not connect up.
I restored the phone back to the F ROM/Chinese CSC setup and don't worry about it at this point.
As I understand so far, what ever phone 'ROM version' you have is the CSC you will need to flash, meaning if you have an F ROM for example,you'd need to flash a CSC package that is 'made' for F ROM's. My 8+ went from an International 8+ 955F to look like and ROM function as a Note 8,so I needed a Note 8 CSC if I cared to have that 'match' more specifically to my local carrier, AT&T.
I can't say that the XAA Note 8 CSC works any better than the original 955F International CSC with AT&T, or not.
For my 8+ F, I flashed a Note 8 ROM, and wanted to find a Note 8 CSC (US) package for the phone, as I wanted the CSC to match where I live.
It wasn't really necessary, as the phone had an F (International unlocked CSC sorta thing stock on it) whick worked just fine here in the US. Never the less, I found the correct Note 8 CSC and set that up correctly with an XAA CSC, and it works just fine, as well.
test
Hodori75 said:
I read all the posts about how a phone branded and bought in Korea needs to be on a Korean simcard for at least 5 min or so before it will accept any other (non-Korean) simcards.
So since I was based in Korea I bought the S8+ (SM-G955N - 128GB/6GB version) in Korea as soon as it was launched in April 2017 and used it with my Korean telecom provider (KT Telecom) for over half a year. In that period, while travelling outside Korea, roaming on LTE in different countries was never a problem.
Recently, I have moved from Korea (to Europe) and got a local simcard (Vodafone - NL). I can get on my provider's network, receive/send calls/sms, etc. No problem, but no LTE! Only some 3G/Edge!
I tried the 'service menu' with *#2683662#, access is possible but it gave back the same:
ServiceMode
Not supported
Mobile: null
Mobile_IMS: null
So first I thought it was related to KT Telecom how their GiGA LTE technology is somehow dependent on the use of a KT Telecom simcard with the KT Telecom network and basically without the KT Telecom simcard, basic LTE functionality would stop.
So I am reading through the different internet forums and advice from other users, but as far as I can tell, I don't think there is any other solution for me then to flash my phone with a less 'Korean-ized' stock firmware and hope this will resolve my problem.
Since, technically my phone is still under warranty, I am a bit taken back with all the extensive 'liability waivers' and step-by-step instructions. Rooting and flashing my phone is my last resort option.
I am just wondering if there are any other SM-G955N users out there who encountered the same problem and made some progress in any other way. Any feedback or comment is mostly appreciated.
Click to expand...
Click to collapse
I have family members visiting from Korea, and they have the same phones. I was trying to set them up with US Mobile which is a T-Mobile's MVNO. So initially, I've faced the same issue as you, where I was only getting the voice calls working and no data. I was able to download an app called Force 4G LTE from the app store that let me change the radio network setting to LTE Only (or other options that include the LTE band). That fixed the data issue and I was getting LTE from that point.
The next problem I ran into, however, was the voice. When LTE is on and working I was no longer getting voice calls (both outbound and inbound). And when I switch it to some non-LTE radio band to turn on the 'Edge' signal back, voice worked again. I chatted with a US Mobile's service representative for a while to try to fix the issue -- in the process also tried turning off HD Voice / VoLTE option -- VoLTE wasn't working for me anyways since I am not using T-mobile's service directly. But that didn't resolve the issue either. After many different tries -- I had to eventually just give up and tell the family member to stick to internet calling for their duration of the visit.
The problem seemed to be that the phone couldn't simultaneously use LTE for data and Edge for voice and was connecting to either LTE or Edge for both.
I'm curious about this as my Korean Note 8 did not need local activation, and with all the research I found Korean models are never SIM or carrier locked and do not require regional SIM activation like the F variants.
As far as using a 935N on tmobile in the USA as long as it supports LTE bands 2,4 and 12 it should work fine. Out of the box my Note 950N worked on LTE and by manually enabling IMS and RCS in the IMS Settings app, VoLTE worked too.
I have since created a CSC patch that changes the CSC to T-mobile to make the phone features more applicable, and add T-mobile's wifi calling but I'm fairly sure the S8+ is basically the same hardware as a Note 8 so if all you need is LTE data and voice calling you shouldn't need to flash anything.
To correct a misinformation about CSC per device, they are not platform specific. My T-mobile patch uses a mostly stock 950U T-mobile CSC base, and I can tell you that there is nothing in the CSCs themselves that has anything to do with Exynos or Snapdragon.
I have the same problem
I have the same problem
Vicious_jm said:
I have a SM-G955N Korean model I bought from eBay. Everything works except Mobile Data. I call ATT (my service) got connected with their Advance Division, and they not did help.
We tried setup a new connect under Access Point Names with no luck. I did notice that more ATT type APNs did add to the list of APNs, I tried each and powered off the phone each time, no luck.
My Wi-Fi works just not the Mobile Data. I typed in the Service Mode code which I got from another thread *#2683662#,(thanks XDA Developers), what I got looks like this:
MAIN MENU
[1] Protocol
[2] UE Setting & Information
[3] ETC
MOBILE: null
MOBILE_IMS: null
When I access The 1,2,3 pages I always get the MOBILE: null and MOBILE_IMS: null at the bottom of every page. My guess these are error codes.
Any help or ideas would be great.
Thank you.
Click to expand...
Click to collapse
Here's some more information about this issue.
https://forum.xda-developers.com/showpost.php?p=81262805&postcount=18
Hi, I got a Samsung Galaxy J7 Prime off Amazon, problem is that I am currently in the USA & using a T-Mobile USA line, the device is unable to detect the carrier's 4G LTE or 3G Networks, it only picks up 2G (Edge) networks. I have switched sims a few times & toggled the 4G/3G/2G & 3G/2G auto connect options, but nothing seems to work. I was informed that perhaps the device is not compatible with this carrier. Does anyone have any experience with this issue? As I need fast internet on my phone & can't afford to purchase a new phone at this point.
Thank you
According to this Samsung SM-G610F Galaxy J7 Prime TD-LTE Compatibility on T-Mobile (United States) Mobile Network
you should be able to at least access 3g.
I don't know if its possible to change the LTE frequency band on the J7 Prime via Service Mode / Secrets Codes
Something like this Change Network Bands on Any Samsung Phone Without Root
*#0011*#, key input: Q 0000
Then navigate through the menus and look for bands and find t mobile bands
Hi, unfortunately, this didn't work, can you explain a bit more how I should do this?
Thanks.
fullofhell said:
*#0011*#, key input: Q 0000
Then navigate through the menus and look for bands and find t mobile bands
Click to expand...
Click to collapse
If the codes don't work straight away, you'll need to enter Service mode.
How to do this on the J7 Prime?
Sent from my SM-J700F using Tapatalk
chijoks said:
Hi, unfortunately, this didn't work, can you explain a bit more how I should do this?
Thanks.
Click to expand...
Click to collapse
Sorry for the delay, final projects for school are a pain.. I would start trying in a trial and error fashion, any and all dialer codes for your phone. BUT, u must be on stock for any to work. Find a guide and start punching buttons. Once you get into service mode, u will need to locate service bands and switch them to LTE that are within t mobiles service structure. Usually around 800 and up. I hope that helps. And good luck, I tried this for 2 months with a note 4 and couldn't get very far. If it's unlocked, sim and Carrier unlock, it should be easier. Also make sure the imei isn't blacklisted. Swappa allows u to check. All of these things must be done concurrently with the proper band selection. Good luck and just stick with it.i actually got mine switched from a sprint device to a t mobile, but unfortunately the device only works for 2 min increments due to a device financing block the previous owner had still. So it's sitting in my drawer of a smart phone graveyard
If you have root try this app
Phone INFO ★Samsung★ on PlayStore