Hi, I just bought a new iPhone 7 plus and stayed with AT&T. I went to unlock it for re-sale and was denied because I had used an upgrade from another plan member to upgrade it last year, (even though my number is now free of contract and the other person has an IPhone 6.) I tried using cellphoneunlock.net to get the sim unlock, and even though I emailed them and was told it wasn't a problem, I got a message back 5 minutes later saying they couldn't do it, but maybe if I pay them another $35 they could. I canceled the payment obviously. Does anyone know of a reliable unlock service that they have used recently with an on contract iPhone 6s plus on AT&T? It seems like most of the sites I have looked at say they can't. If anyone has some recommendations it would be appreciated. Thanks!!!