Your iPhone will crash if it receives a text message containing just one letter, Apple has admitted.
The tech giant is urgently working to fix a bug which brings the device to its knees when a single character in Telugu, an Indian language, is sent to the device or typed in its text editor.
The problem also affects the software which powers Mac computers, Apple Watches and Apple TV devices.
Older versions were not affected by the bug and Apple said it has already fixed the issue in the current beta versions of the operating systems.
Devices running on iOS 11 crash when any application receives the character, The Verge reported.
It causes apps to become unresponsive, including Apple’s iMessage and third-party applications like WhatsApp, Gmail and Facebook messenger.
However, some apps like Telegram and Skype seem to be unaffected.
You can see the dangerous letter in the tweet below.
Telugu is one of 22 languages with official status in India and is spoken by 74 million people.
Early European explorers said Telugu sounded like Italian because many of the words end with vowels.
But you’ll be using this very modern expression which begins with a vowel if hackers use the ancient Indian language to crash your iPhone: ‘OMFG!’