I can't access to my massages because they sent me the prank message

Read this http://www.macrumors.com/2015/05/26/ios-bug-crashing-iphones-with-text-message/

the Solution 2 step:

1-put your iPhone date two month forward

2-go to settings > Messages >(under Message History, select keep messages 30 day)

NB: this will fix the problem but will delete all your messages inbox.

Hello Rodolfotovar7,

Thanks for contributing to the Apple Support Communities.

If the Messages app on your iPhone still quits unexpectedly after you received a message, the steps in this article can help:

If Messages quits unexpectedly after you get a text with a specific string of characters - Apple Support

All the best,

Jeremy