I have the ZTE z831. AT&T is the carrier on the phone. I want to update my software to Android 8 but u must have service thru AT&T .Witch I do not. How can I get around this?
Sadly, ATT requires their branded phone to have active service to get the software update and there is no way to get around that.
I would say, the easiest way to do is borrow a friend's SIM card to get the update. Alternatively, you may able to go into an ATT store and borrow ask their staff for a SIM card that you can borrow to maybe update the software.