Simplest way to unlock iPhone 5s on AT&T...
I am getting iPhone 6s Pluses as a replacement for our 5s iPhones from AT&T. I have requested (and should not have a problem getting) the unlock codes for the phones from AT&T. I want to sell the phones to Gazelle as unlocked for an extra $10 each. I don't want to have to go through the hassle of backing up my old iPhone 5s, erasing it, then restoring it in order to unlock the phone (which are the instructions from AT&T) since restoring all of the apps, music, and movies will take at least several hours and I have to do this on several phones. I would do the backup and erase no matter what before returning it to Gazelle to make sure it's clean of my data.
I know I need to backup the old iPhone 5s in order to restore it to the 6s Plus, but can I get around restoring the old backup to the 5s to unlock it and just activate it as new? I just want to save the time the restores take on each phone when I will also need to restore them to the 6s Plus phones. My 6s Pluses are being sent to me from AT&T directly, so can I just backup the old 5s phones (one at a time), erase it, and then activate it as new and have it prompt me for the unlock code (i.e. would it prompt me to unlock it without doing a restore with the old SIM in)? Then, I would go on AT&T website (www.att.com/activations) and activate the new 6s Plus SIM and phone and restore the 5s backup to it. Would that work?
I hope this is making sense. I would appreciate any help you can offer me. Thanks in advance! If worse comes to worse, I'll skip the unlock and just not get as much from Gazelle, and do the backup on each 5s, erase each 5s, and restore the backup on the new 6s Plus like I would if I wasn't wanting to try to weave unlocking into this process.
iPhone 5s, iOS 9.0.2