on Android there's a setting people apparently keep accidentally triggering that calls 911, five power button presses and then a confirmation swipe.

anyway it's been in the news and reminded me that people probably don't know this:

that number doesn't have to be your country's emergency number, you can change it. Mine calls and texts my lawyer, or if I'm away from home, texts my lawyer and calls the NLG

this doesn't override the normal emergency call swipe