Sim Unlock on April 1 update marshmallow - AT&T Samsung Galaxy Note 4

I have an ATT note 4, on April 1 security update for marshmallow....
Att notes that the phone is still under contract.
What's my best route to getting an unlock?
Thanks!!!

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Bought Refurbished Samsung Galaxy S7 Active on Amazon...want to update to Oreo 8.0 OS

Hello, and this may have been asked earlier but sometimes when there is so much information out there, it can be overwhelming and you don't know what is good advice and what will brick your phone. Anyways, I bought my AT&T Unlocked Samsung Galaxy S7 Active phone on Amazon, it is refurbished. It currently has Nougat 7.0 with the Dec 1, 2017 latest Security Patch. I have a Prepaid AT&T Sim Card in there and it has been in the phone for about 18 hours now and still no OS update notice for the Oreo 8.0 that is available for this phone. AT&T Customer service said it should get update within 24 hours but I'm losing hope in that and if or when it will ever happen. I guess my next method would be to Flash the updated Oreo 8.0 OS on the phone with Odin. All which I have but hesitant on doing this because I honestly have no clue what I would be doing and if I would get the right updates from my build to the latest build that is available for this phone in the Oreo OS. If I were to go that route, what is the proper sequencing for this so I don't mess up my phone and install the wrong updates and where do I find them? A lot of newbie questions here so be kind. Thank you
Make sure your ATT account has the S7 Active on the account. Not sure if a prepaid SIM will work for updates - you may need a friend with a postpaid ATT sim to get the updates working.

ATT S9 Update Issue after 3rd party network unlock

Hello Experts,
I have a US ATT SM-G960U. I got it network unlocked outside USA. It is on Android 8 and when checking for updates, it always says its up to date. I also tried through SmartSwitch and its the same. The last security patch was from June 1, 2018.
I have downloaded G960U1 Android 9 with April Security patch from SamMobile and Updato. If I update my mobile through ODIN,
will SM-960 U1 patch work fine with my device?
will it lock the device or will the network unlock still be as is?
will I be able to use the device with other carriers?
will I be able to update the patches in future?
will it affect my device?
Please suggest,
samsunggti9000 said:
Hello Experts,
I have a US ATT SM-G960U. I got it network unlocked outside USA. It is on Android 8 and when checking for updates, it always says its up to date. I also tried through SmartSwitch and its the same. The last security patch was from June 1, 2018.
I have downloaded G960U1 Android 9 with April Security patch from SamMobile and Updato. If I update my mobile through ODIN,
will SM-960 U1 patch work fine with my device?
will it lock the device or will the network unlock still be as is?
will I be able to use the device with other carriers?
will I be able to update the patches in future?
will it affect my device?
Please suggest,
Click to expand...
Click to collapse
Please help me
G960u att imei unlock code

Note 10+ SM-N975F October Update

Hello everyone
I have a Note 10+ (SM-N975F) without root
CSC TPA/TPA/TPA
Last month I got the September security patch update without any problem.
The new update with the October patch has been published since October 17th, but my Note can't find any update.
Any idea why this might be happening ?
Thank you for your help.
Regards.
Are under a operator branded phone?
mingocr83 said:
Are under a operator branded phone?
Click to expand...
Click to collapse
No, is unbranded version.
It's never happened to me before.

Unlocked SM-N975U1 purchased from Microsoft Store -- want to upgrade firmware

I just acquired a new unlocked Galaxy Note 10+ SM-N975U1 a week ago from the Microsoft Store. I got it working on the T-Mobile network without issues except for firmware upgrades. The device automatically downloaded & installed about 5 upgrades but stopped when showing:
Software update information:
Current version: N975U1UEU3CTC9 / N975U1OYM3CTC9 / N975U1UEU3CTC9
Security patch level: April 1, 2020
From what I can tell, this seems to mean that I am running Android 10, but not OneUI 2.5.
I'd like to flash a later security patch level and get the OneUI 2.5 update. Is SamMobile.com the best place to get the latest firmware? If so, should I choose the latest "USA (T-Mobile (TMB)" option even though this is not a T-Mobile locked device? Or, is there a better option to select?
Thanks in advance.

Sprint/T-mobile Galaxy S20 Ultra Software Baseband Incorrect

UPDATE AS OF FEBRUARY 22, 2021:
There are serious communication problems between Sprint/T-Mobile and Samsung Technicians regarding software build and Baseband versions or just a complete lack of knowledge. As a consumer, I have received many conflicting responses from the Technicians on both sides that's incorrect! Sam Mobile cleared up my questions regarding the software and Baseband versions released by Sprint.
I took my phone to Samsung's preferred UBreakiFixIt store and after 5 hours, I was told that they couldn't flash my phone with the Samsung, T-mobile or Sprint software. I contacted Sprint and after 1 hour, the technician said that my phone has Sprints latest update and to look for future updates. However, Sam Mobile lists Sprints latest January 1, 2021 update as: G988......CUA4 posted on February 5, 2021.
At this point, Sprint customers with a Galaxy S20 Ultra running the G988....CTL1 security update from December 1, 2020 must wait for Sprint to release the January 1, 2021 security update!
Please respond if you've already received the January 1, 2021 security update from Sprint for your Galaxy S20 Ultra and disregard my post below. Thanks!
In January 2021, I received the December 1, 2020 security update from Sprint/T-mobile. I noticed the different software update version numbers listed in the What's New section after installing the update, but didn't think much about it until I couldn't download the January 1, 2021.
I checked the T-mobile website and learned that the Galaxy S20 Ultra had to have Baseband version (Located in the About Phone section under Software) G988U........CTL1 in order to receive the next security update. Unfortunately, Sprint/T-Mobile installed Baseband version G988U.....CUA3 on my phone. I checked the link to Samsung to review the software updates that were installed on my phone and they have the latest updated version as: G988U....CUA4 which is not installed on my phone!
I contacted both Sprint/T-Mobile and Samsung and they decided to point fingers at each other because the CUA3/CUA4 software updates don't exist, they aren't valid according to their Techs. But Sprint/T-Mobile installed the security update OTA in January. See attachments.
I understand that I need to have my phone reflashed with the original One UI 3.0 OS 11 software in order to receive future software updates.

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