YSK that Apple phones send an SOS message to your emergency contacts if the home button is pressed repeatedly super fast.

Found this out by getting a wierd text from my bff. Turns out her toddler had gotten a hold of her phone and mashed the home button! So everyone was fine, but I'm glad we know about the feature now.

This could be especially useful for situations where you couldn't text or call (domestic violence, panic attacks, etc).