How to Crash an iPhone with a Message: iPhone users who receive the string of text characters with Messages open would not be able to go back to other conversations without crashing the app, but… ...if the string is received while the iPhone is on the lock screen, users would be unable to open the Messages app entirely, or in some cases, the text could cause the iPhone to reboot without any notice or explanation. Some Workarounds to Undo the Effect: However, there are several workarounds that can undo the damage. The effect can be undone by sending another message (any normal text) to the person who sent you the malicious string, canceling out the initial strand. Another option is to send the person who sent the the string a message using the share sheet by simply pressing the "share" button in other apps, or send yourself a message via Siri, or ask Siri to "send a message" to whoever sent it.
Video *PROOF*
OK, here's the strings: [Hidden Content]
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Some articles online discussing this bug. Stop commenting it doesn't work for you. It's a bug, if it don't work for you, it don't work for you.