Imessage app keeps crashing

I have an Iphone 4s and a friend was spamming my phone, after that my messaging app will crash and close every time i click on it.
I have tried turning on and off the phone, also turning on and off i message, any ideas?

Delete the messages your friend spammed you with, and then clear your multitasking, After, try restarting your phone again. It will probably work.

Hold down the home button and the lock button together until you see the apple logo appear and then release the buttons this will hard reset the phone and after this your phone should work fine.

It shuts me off before I can delete them…

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