A bug was uncovered in iOS recently that crashed the Messages app when users received a message with a unique string of Unicode characters.
Follow these steps to re-open Messages on your iPhone:
- Ask Siri to “read unread messages.”
- Use Siri to reply to the malicious message. After you reply, you’ll be able to open Messages again.
- In Messages, swipe left to delete the entire thread. Or tap and hold the malicious message, tap More, and delete the message from the thread.
Update: The Guardian pointed out that the issue also affects Twitter and Snapchat. If you’ve got notifications turned on, receiving the string via either app will crash your phone.
You also won’t be able to open your chat history with the sender to delete the message, without crashing your device.
Until Apple issues a permanent fix, you can protect your device by turning notifications off for Messages, Twitter and Snapchat.