Why won't my iMessage activate?

I was messing around on my iPhone 4s (iOS 6) and I changed the phone number to my house phone to see what would happen, and then I had sent a text message to a friend and she received it. Then I went back to phone settings and changed it back to my original phone number, and now iMessage won't work!

It's been stuck on "Waiting for activation… " for a while now. Currently, my send button is blue but my messages are green! I'm at a strong wi-fi connection, and I don't know why my phone is doing this. I had tried to reset my network and all that, and yet nothing is happening!

Go into your settings into messages and make sure iMessage is turned on. And that your friends phone is set to iPhone, other than that i don't know

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