2 Replies Latest reply: May 29, 2013 3:16 PM by tmo_vanessa_s RSS

How do I reactivate my prepaid phone?

So I have a MyTouch 4G that used to be on a prepaid plan many months ago. I'd like to start using it again but I can't figure out how to reactivate it. I can't reactivate it online because I don't know my sim card's activation code, and whenever I try to do it from my cell it tells me invalid MMI code. Do I have to contact T-Mobile directly? Or do I need an entirely new sim card? Any help would be totally appreciated!