An alert to smartphone users: the iPhone is vulnerable to a new bug. A bug that’s easy to find, and to send. The bug, which is made up of some Arabic letters and a series of symbols, causes your iPhone or Apple Watch to shut down if sent to you via a text message. Apple released a statement saying it is aware of the issue and is working on a fix. So far, the bug seems to be more of a nuisance than a serious threat.