IPhone :: Change The Apple Id Password On 3gs?

It doens't verify my Phone Number, only able to use my Apple ID to send iMessages, so my girlfriend, recieves my iMessages, from my email address.FaceTime was working, I didn't touch it at all, I left it alone.today I actually restored it, TWICE. Twice because I backed it up for the first restore, and than the second restore, I restored it as a whole entire new iPhone, and still, my iPhone isn't registering my iMessage with my Phone Number, my carrier is Verizon, I've gone all through the Forums, did pretty much EVERYTHING on here that you could think of, I've even left it off for a good couple of hours, and re-tried it, I've left it to switch on over night, and it failed to turn on it says. I've never encountered a problem with my phone until this week, around 2 days ago, not quite 3 days.Like I said, I've done pretty much everything.Are the iMessage servers down or something?This is quite annoying.

Info:
iPhone 4S, iOS 5.1