How to activate my iMessage?

I have an iphone 3GS iOS 5.1.1 and I've always used iMessage before but I started messing with all of my settings and now my iMessage won't turn on. I switch it to "On" and it gets stuck at "Waiting for Activation… "

It doesn't even ask me for my password or anything, it just stops at that.

You may have to check the email you registred your iMessage with or your Apple ID email for an activation email. If that doesn't work, contact Apple.

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