Okay so my family has a family plan that has 3 lines, two are 60$/month and one at 10$/month, where Im one of the 60$ main lines. If I end my contract early (I wanna switch to T-Mo for the Sensation), will the 10$ line be made a 60$ line or remain 10$?
Yep, I would stay the same $10 every month. Be prepared to pay the ETF if you didn't already know. Also, I hope you're not going to regret switching if you do not get very good reception from T-Mobile.