Me again. If buy a clean (good IMEI etc) iPhone 7 that was sold for Verizon, can I unlock it and use it on my AT&T account? I'm not looking for one of those dumb "UnlockMeCodez.com" things either - if I call Verizon personally, and the phone is clean, will they unlock it? I'm after resale value and a global phone, hence why I'm looking for the A1661 model. Thanks!