IPhone 4 iMessage not working?

I have an iPhone 4 in white. Basically my iMessage isn't working. I have tried everything from turning iMessage off and on, turning the phone off and on to even restoring my iPhone. Please help as its costing me a bomb to send messages as rely on iMessage to text work people.

I'm happy

Go to setting - notifications - select messages and then it depend how you want to adjust it.

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