Why won't my iPhone open messages?

My iPhone won't open the messages app. I'll tap on the icon and it starts to open but in half a second it just crashes.

This has happened many times to me before. I think I remember completely shutting my phone down and it worked. If that doesn't work try your setting or an Apple help center!
Hope this helps.

Its a bug. Check sites like AppleInsider.com about it.

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