how to activate iMessage, how to activate iMessage
How do I get my iMessage to work?
iPhone 4S, iOS 7
How do I get my iMessage to work?
iPhone 4S, iOS 7
If you are on wifi, turn it off and let the phone connect to the cellular network. Once it does, iMessage should activate and you can turn wifi on. If you are not on wifi, try turning iMessage off and then on again.
You can try using some of the pointers here:
how to activate iMessage, how to activate iMessage