Why isn't my iMessage working on my iPhone 4s?

Okay so my iphone 4s is currently running ios 6.0.1 and for the past 2 days my iPhone has been sending text messages in the regular form (in green) and the other person that i was texting had it turned on, so i checked if my imessage was turned on and it was but it said waiting for activation for hours.under it it said that there was no addresses to receive it at so i tried clicking my phone number but it was gray and didn't work, only my email works and i don't want that. I turned on and off my phone and reset the network settings but still it does work.

The iMessage servers are down.

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