Works like a credit card.
If you buy a tv and then drill a hole in it. Thats on you. you still gotta pay your credit card bill. If you dont pay your bill then they jack up your credit and send it into collects.
No if you try to return the phone or get it fix for another problem. Samsung and Tmobile can tell you knw because you modify the phone.
if im wrong tell me. I'd ratter be correct then live life being mislead.
Phone: HTC One m7 Tmobile root stock
Other Phone(s): T-mobile G1 < Htc Vision G2 < LG-P999 G2x < T989 S2 , HTC One m7 < Soon Note 3