I'm trying to get my (fully paid off) iPhone 6s unlocked through AT&T. A few months ago, I got the iPhone replaced at Apple due to a problem, so the IMEI number apparently wasn't updated through AT&T's database. Yesterday, I put in the unlock request – checked on it today. Denied due to a mismatch. I called AT&T, explained the situation, was told they updated the IMEI to match what I have, and that it'd be safe to go ahead and put in the request. I put in the second request, and it still was denied (just checked) due to an information mismatch. I'm at a loss what to do. This has been frustrating, with many back and forth calls with AT&T. Any tips or help would be appreciated. Thanks!