These delicate flowers could turn their smart phone off and leave it in their flight bag for flight operations use only.
Or throw the smart phone away and buy a dumb phone and don't pay for any data at all: The Nokia 3310 is back and the Telstra Easycall 3 or 4 granny phone does not even have a camera so you can't take pictures that would make you look a fool. Make actual phone calls and text the old-fashioned way. Enjoy battery life of a week or more.
Don't have facebook as your pc homepage, have pprune!
These people seem to have forgotten that there is an off switch on these things. Out of sight, out of mind.