Why won't it let me send iMessages?

Ok so I updated to iOS 6.0.1 and the person I'm tryin to iMessage is on IOS 6.0.1 on iPhone 4S I'm on iPhone 4S to it won't let me send a iMessage and there down as an iPhone as well please help!

Try going to settings-messages, and seeing if imessage is on. Also if "mms messaging" is on too. If those are both on, i would say they got rid of their iphone or if thats not the case. Try restarting your phone. Or double click home and kill the messaging app and try again with the imessage. Or restore your iphone.

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