We can't unlock this device because it hasn't been active for at least six months of paid service.
When i tried to unlock my att prepaid iphone se, I got denied for the above reason.
I have used the phone for roughly 6 months, but I don't know the exact time. How can I check how long I have been active for paid service? (since I don't have the account any longer, so I can't really check the history)