Everyone's been in that situation when they were walking home and felt perhaps a little unsafe.
In the dark nipping down city streets, you're not daft enough to take shortcuts - but you do keep your phone in your hand just in case.
Well, now you don't even need to dial 999 to get some help if you're unlucky enough to need it.
A hack that works on iPhones is being shared online and it's a total game changer if you're a walking worrier on these darker nights...
A tip for iPhone users who find themselves in worrisome situations:
Clicking the lock button 5x initiates an Emergency SOS distress signal. It gives you 5 seconds to cancel.
— Stella Nandia △⃒⃘ (@StellaNandia) December 18, 2017
It's true - and here's what it looks like.
You can also add emergency contacts. After an emergency call ends, your iPhone will alert them with a text message and tell them your location.
What a helpful trick. We hope you never have to use it, but just in case.