How is he flipping phones bought at full retail, I just don't see the market or the profits.
what it looks like he was doing was getting a interest free loan from them and making a few bucks as the phones weren't full retail. so example, at one point they had a 5s for around $500 total. He buys it and starts paying the monthly rate and turns around and sells the phone for $650 etc. pockets his $150 or whatever he makes and enjoys the cash in his pocket and continues to pay monthly.
my bet why it got flagged was bc the phones were never used on his T-mobile account and were quickly sold and showed up on other people's accounts. meanwhile, he's still paying monthly which it's attached to his account. So really, it doesn't take a genius to figure out what he's doing especially when they have different flags set up. To the normal person like us, it doesn't make sense. But to me, looks like he was just using them as a bank and getting an interest free loan.