So Isis can shut my phone off????????

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

As to ISIS crashing my phone, I'm not worried. I don't have any friends there.

For the people who are stuck in a reboot loop: IF you have a back up or don't care about erasing your phone if you don't have a back up and you use Find my iPhone: Go to icloud.com and log in. Click on Find my iPhone. Click on All Devices on the top of the window. Click on your phone/device. Click Erase and just skip through all the phone number, message stuff. When your phone comes back on you'll get the hello screen and you set it up like when it was new. If you have an iCloud back up from before you got the message that messed your phone up restore from that and you will be fine.

For those who can't get the other things to work:

1. Settings>Messages> Turn iMessage off
2. Use Siri to send a message to yourself and the person who sent you the text. You can also go to photos and pick a photo to send to yourself and the person who sent you the text.
3. Settings>Messages> Turn iMessage back on
4. Go Open Messages and delete the conversation with the text in it.
5. If you still can't open Messages or iMessage won't activate reset your network settings by going to Settings>General>Reset>Reset Network Settings.
6. Go to Messages and delete the conversation...

That should fix the issue.

Oh, and to avoid it...go to Settings>Notifications> and turn off show on lock screen and show previews.

What in a world are you babbling about?

The real instructions are just a repeat of what the linked article describes. What you added will just lead users to loose valuable data. Please double-check what you write before posting it. It's recommended/required in the User Agreement you accepted when you joined this forum.