For some odd reason, iMessage is just NOT working for me. I attached a pic. Do you see how the number is grayed out? I called the genius bar and she said she hasn't heard of that problem. When I try to send an iMessage, it acts like its sending then it says "not delivered". I turned it off and on numerous times, I signed out my apple ID, nothing I do seems to work. By the way, I am running on a jailbroken and unlocked 3gs on t-mobile. Also, if it even matters, my MMS isn't exactly working right now either. ANY TIPS WOULD HELP! this is killing me!