How to fix crashed messages on iPhone?

I text bombed my friend from my iPhone and now the message app either crashes or is just a blank screen. Same on my iPad. Does anyone know how to fix this. Already tried reset and hard reset neither worked.

Well first of all SELL your apple stuff they are horrible at products get the Microsoft surface because any problems will get fixed for free or you get a new surface. That lasts for 3 years and the windows 8 phone amazing get rid of apple!

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