I'm currently with Sprint and wanting to move to AT&T. We have 4 lines, 2 want iPhones and 2 Android things. I want a 32GB iPhone Silver. I was planning on moving 4 over and 3 of them getting new phones while I wait until the one I want is available. However, I recently learned that AT&T phones can be blocked or black listed if they're reported lost or stolen, even after I've verified it's a good phone and have paid for it. Is there a best way to ensure I don't end up losing money when I'm buying a used phone? I'm even willing to purchase a cheaper phone but don't want this risk. Is buying a very inexpensive GoPhone my only option?