Has anyone experienced problems trying to unlock their iPhone w/ At&t ? So I've had 2 device replacements since I bought my iPhone 6 last Sept. due to warranty issues. The last being in May of this year. I recently paid off my device looking to unlock it, then sell it so I can upgrade to the 6s. 5 days after putting in the request, I got an email stating I got denied. Reason was "The IMEI provided is not a valid AT&T IMEI". Weird cuz I've been using their network for the past 4 months. So a few calls to At&t & Apple pointing fingers at each other later, I finally get a somewhat logical solution. The At&t rep suggested I go to a local store & install a new SIM to re-register the phone on the network, THEN request another unlock. Seems fishy to me b/c it doesn't change the actual IMEI #. Has anyone had a similar experience ? This is driving me nuts cuz I gotta weird feeling they're gonna deny me again & I'll have to sell the device locked to AT&T.