YSK your iPhone has an “Emergency SOS” setting that allows you to call emergency services by clicking the lock button 5 times in a row. You can enable or disable an alarm that plays before calling.

This is a feature that I didn’t know existed until I accidentally started it. It’s incredibly useful in emergency situations and I think all iPhone holders should know about it. Also, please remember to fill out your Medical ID card (you can do so in the Health app).