All Samsung phones are not created equally, and as such, each has its own update schedule.
Each carrier sells its own model that is updated on its own terms, but you can also buy unlocked versions that get updates straight from the company.
Here we have short guide how to activate AT&T i Phone locked after update to i OS 8.
Not to get into i OS 8 update i Phone relock problem follow this steps. With this issue you can use again factory i Phone unlock service but you can pay twice to resolve this problem .
we will provide you with correct AT&T i Phone activation after unlocking and helps your device to stay unlocked for long time.
And also never again become relocked even after i OS 8 upgrading.
The good news is nowadays software updates allow you to get the latest version of a mobile operating system even if you don't have the newest phone model.
However, that's not always guaranteed for every device, and as some smartphone owners probably know, particularly Android users, the update process isn't always swift or smooth.
In a reply to an update query from Samsung Mobile Security Technologies, the company admitted to a less-than-ideal schedule and resolved to fix it: “Due to various circumstances, we have been releasing security updates for unlocked (open) Galaxy devices in the U. Samsung didn’t announce a time frame for the switch, but said the March Android update (which hopefully will include the Nougat one as well) is coming “soon.” Achievement unlocked: If you own an unlocked Galaxy phone, you know full well how frustrating it is to be at the back of the line for updates.If you have already unlocked your i Phone using factory unlocking service but still on i OS 7, please do the following : Step 1. Connect your i Phone to active Wi Fi network and i OS system will do all the work needed and then activate your new status. After you i Device has beeb activated you can install i OS 8 using Wi Fi or i Tunes. After receiving email that your i OS 7 i Phone has been unlocked, you should activate new unlocked status. Remember on this case use Wi-Fi i Phone activation guide not i Tunes. And it’s not just about getting to play around with the coolest new features in Nougat.Google pushes out important monthly security updates that unlocked Galaxy phone users often missed, and it’s great to see that that won’t be the case anymore, especially for those of use who have our eyes on a brand new unlocked S8.
or do i have to do a different update because the phone is unlocked? Thanks, search around the forum i know this has been answered already... Welcome to XDA though Edit: here is a link to unlocking your phone...