Okay, so I have a deal in place to buy a cracked iPhone 6s Plus (lets pretend it's an android) from a stranger. Yes, I know - sounds shady. I never buy electronics from people I don't know but eh. So, the screen is shattered and it doesn't turn on. I have the imei (no proof it belongs to that phone) and it's all good. Seller said the phone was on t-mobile. Do I have anything to be worried about? Can I activate a t moble phone to metro pcs (both gsm)? Will a new screen fix it?