Meh. I went five year without a cell phone and I was fine. Part of this is being clever, thinking ahead, and keeping a cool head.
Another part is herd immunity, as 99.08% of the population has one.
Back in 2014, shortly after I got rid of my smart phone I was walking through the grocery. A dude collapsed with a heart attack. Within 30 seconds I found an RN to attend to him and another person with a smart phone to call 911.