Hey guys so here is the story, I purchased an unlocked Verizon iphone 6S plus off craigslist back in August of last year. I was using the phone on AT&T with no issues up until Monday.... On Monday I ported my number over to T-Mobile, when I popped my new T-mobile sim in the phone it would not activate, when I called T-Mo they told me the phone was blacklisted by Verizon. I'm not sure why I was able to use it on AT&T for so long. I guess it didn't ping the server until it needed to be activated again? I know I am now left with a paperweight that I can't do anything with (unless anyone knows about any way to have it removed. PM me since I know its not allowed here) My question is, would there be any way to avoid this in the future? it kind of sucks that you buy a phone and the person can choose to block it weeks or even months later. Can I call the carrier and inform them that the phone has changed ownership when I buy one or something along those lines? or is buying used iPhones become a risky gamble?