Unlocked SM-G935A seems become carrier locked after flashing official att firmware - AT&T Samsung Galaxy S7 Edge Guides, News, & Discus

Hello everyone..* here is my issue,* I have G935A mobile which was unlocked at version of 6. 0. 1 from* Saudi Arabia.* I flashed it with latest oreo* U firmware,* flashing was successful and the phone runs nicely, but i lost network coverage.* The phone only say emergency call only. <br>
Does this mean my phone become carrier locked?* Is their any help to get back network connection?* Am stuck here please help me

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[Q] Modem and Carrier Unlock problems with a foreign i9305

Hi, I had a P990 (who is simply un-brickable), so I'm comfortable with CWM, I ask to a friend who was passing by France to buy a i9305 for me, he bought one in SFR France, and delivered to me in Brazil.
Neither I or he knows if the phone has some type of carrier lock or something like that, the ROM is full of bloatware from SFR, I make the update on the phone over wi-fi (think it's called FOTA update, right) and now I'm on JB 4.1.2 version.
With *#1234# command, the info that shows is:
AP: I9305XXBMB4
CP: I9305AEBMB1
CSC: I9305SFRBMB1
Other info that could help:
Build Number: JZO54K.I9305XXBMB4
My problem is that trying to use my carrier in Brazil (VIVO), the phone has a very poor signal, it even sometimes in the signal strength at notification bar puts a Ø in place of the signal.
Other think that bugs me, is that in About device > Status, the field "My phone number" shows Unknown.
When I get the Ø in notification bar, if I go to About device > Status, the field "Service state" shows Disconnected, even if Signal Strength has more than 7 asu (think 7 asu is the minimum to get signal, right?)
So, my questions are:
1) Do I need to flash other ROM, CSC or modem, to get a good service in Brazil? Because phone is 100% stock from SFR France.
2) How can I know if the phone is carrier locked or something like that? If I flash a custom ROM, (like rXTREME) it will unlock carrier for me?
I have already make a backup of my IMEI using the tutorial in the DEV Section of our phone HERE and got the 250KB file.
Thanks for helping me =)
Do I need to flash other ROM, CSC or modem, to get a good service in Brazil? Because phone is 100% stock from SFR France.
Flash modem and c|Sc for your carrier .
2) How can I know if the phone is carrier locked or something like that?
Ni network on any other sim .
If I flash a custom ROM, (like rXTREME) it will unlock carrier for me?
NO
jje
JJEgan said:
Do I need to flash other ROM, CSC or modem, to get a good service in Brazil? Because phone is 100% stock from SFR France.
Flash modem and c|Sc for your carrier .
2) How can I know if the phone is carrier locked or something like that?
Ni network on any other sim .
If I flash a custom ROM, (like rXTREME) it will unlock carrier for me?
NO
jje
Click to expand...
Click to collapse
Ok, but I go to SamMobile to get a firmware for my country (Brazil) and no GT-9305 firmware was for Brazil, only GT-9305T.
I find that the only difference is the 4G signal that the international version has more bands (800/1800/2600) than the GT-9305T (1800/2600).
My new questions are:
1) What's the differences from GT-9305 and GT-9305T?
2) Can I flash a CSC and Modem of a GT-9305T on my GT-9305 (without T)? It will not brick my phone?
Nice question i was wondering that too if it was possible to do so ?!
Thx
GaLaXy S3 I93o5 1s th3 b3st s0 faR ...☆♡☆

Flashing factory unlocked firmware

Hey, so I'm really new to Android (this Note 5 is my first Android phone) and I don't know much about firmware flashing, so I thought I would inquire here... I have the SM-N920I model of the phone, but it was a Spark (New Zealand carrier) phone so it's not factory unlocked but it has been unlocked as I can use my Vodafone SIM. Since it has the Spark firmware, there is the Spark boot animation, and I was wondering if I could flash the factory unlocked firmware onto the device to get rid of this and a couple other things that bug me a little with the carrier firmware.
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hi friends, i need your help again, i have in my hands one galaxy s6 tmobile but one person install android 6.0.1 in this phone, i see one metod, installing one update of one samsung galaxy s6 of metropcs, but this metod no work in this phone, i can dowgrade to android 5.0.1?? or i can istall cwm in this phone?? any help thanks
Try using the new Cellular South firmware thats out and flash it on the phone, its 6.0.1 MM. Go to Sammobile to download.
Oh man, I've been waiting for this firmware! I had a TXAR phone that I flashed the T-Mobile version to, and surprise(!), it locked my previously unlocked phone.
I use Net10 for prepaid service, and they use both sets of towers, so it was easy to switch sims, but I want to put an ATT sim back in for better coverage.
Thanks for letting me know about this.
OR you could try my method.... http://forum.xda-developers.com/tmobile-galaxy-s6/help/sim-unlock-t3374445

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Hello there XDA Members,
I have a massive problem and I hope someone in this forum is able to help me, I have an S6 Edge SM-G925F, I recently broke my phone and sent it to repair they repaired it and installed firmware that is non EE therefore I lost my WiFi Calling feature, I was like okay let me just flash the EE firmware unfortunately due to the bootloader they installed being newer then the one from the EE firmware it wont let me install (SW B: 2 K: 4 S: 4) this means that the firmware I am trying to install is older and samsung bootloader wont let me, now I want to know if there is a way I can:
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I bought a Factory Unlocked Note 8 from Amazon model name is SM-N950U . I use Phone Info it told me my model is SM-N950UZKAXAA and working on XAA csc. It's running on Verzion Firmware but has no bloatware and carrier provide info is XAA/XAA/VZW . But i haven't receive any OTA update until now. I used smart switch it told me "Your current version is lastest", and verizon software update told me "The current firmware is not supported !". But i try many times to flash verizon firmware version but my phone still not have any carrier bloatware and still have no OTA update !
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