A terrific but hopefully 'never used' feature of your iPhone is the Emergency SOS function. It's designed to assist in calling for Emergency Services in the event you need their help and also to notify your Emergency Contacts of your need for help, along with your Location so they can help lead Emergency Services to your exact location. Its worth taking a quick look at this video just in case you ever need that emergency help. Hopefully this is not a feature you ever need to use, but it may also save your life. Stay Safe Friends!