The Galaxy S8's SOS feature makes it easy to notify a trusted contact when you're in danger. Let's hope you never find yourself in a position to use it, but it's better safe than sorry. Like most good things in life, there's a little bit of setup involved. Go to Settings Tap Advanced features Select Send SOS messages Turn the switch to ON to enable the feature. Specify recipients to receive the message, as well as any text, photos and audio recordings you also want to attach to the message. Once you're done, tapping the power button 3 times will then activate the SOS message.