Apple iOS Messages bug also affects Snapchat and Twitter users99+
Snapchat can also transmit the message, and if the recipient tries to open it, his iPhone will crash. While the message cannot be cleared, posts from other Snapchat users can be received without an issue.
Since the release of the precise string of letters and symbols has been made public, people have been trying (mostly as a joke) to crash their friends' iPhones. While disabling notifications will save your iOS device from feeling the effects of the message, it won't prevent your Snapchat or Twitter app from becoming disabled. The particular way that iOS handles notifications is believed to be the root cause of this bug.
Just the other day, Apple issued a workaround and said that it is working on a fix for the problem. This fix will come in the form of a future software update.
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source: TheGuardian via WTSP