IPhone 4 message app keeps crashing?

Ok this isn't like a normal crash. When I'm texting someone and then I tap the messages app in the top left corner of the screen the button goes darker to show I tapped it but then it freezes and goes back to my springboard or home screen. Please Help!

P.S. I've already done a hard reset. And turn on and off

Jailbroken? Never heard of that happening otherwise.

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