The problem is also affecting Macs and Apple Watches, and once triggered, it will continue to crash messaging apps every time a user tries to open them after reboot. The latest update to iPhones is also claimed to fix an issue where some third-party apps fail to connect to accessories. On its website, updates are titled iOS 11.2.6, watchOS 4.2.3, tvOS 11.2.6, and High Sierra 10.13.3 Supplemental Update. The company had promised to resolve the issue before the public release of iOS 11.3.
This will prevent a bug which means that "processing a maliciously crafted string may lead to heap corruption" - which doesn't sound very nice at all.
While you can avoid these symbols and wait for Apple to fix the bug, TechCrunch says there are a number of "ill-intentioned" people who are deliberately sending the bugged character to unsuspecting iPhone owners.
This update and bug come in the wake of the recent decision made by Apple bosses to slow down the pace of iOS development. It makes sense as Apple was forced to release a couple of other bug fixes in recent months. To download the update, you need to go to Settings General Software Update and then follow the on-screen instructions. It also affected macOS.
The bug will only crash the entire iPhone if a notification card or banner containing the character pops up on the device.