Okay so yesterday at school my friend was selling and iphone 4 which was at a good price of 150 so i bought it the next day and didn't tell my parents anything how do i break it to them that i got and iphone and that i want to activate it. My parents are kinda mean and I never had a phone before so if I take it to At&t will the make me sign up for a contract? and how much are the plans I don't want an expensive plan though something cheap because my parents don't like paying much for stuff.