Liz bought her first smartphone today, an iPhone 7. The Apple customer support person we spoke to was great and she passed along this really clever tip.
The iPhone or iPad is on the table and you're eating a sandwich and you need all your fingers to hold the messy thing together and your phone buzzes and you need to open it but it requires a fingerprint and your thumbs are too occupied keeping the damn sandwich from falling apart to deal with that.
But if you have added your pinky fingerprints to the Touch ID, then you can hold on the sandwich and use either pinky to unlock the phone.
I don't use my pinkies much, but I would certainly miss them if they weren't there.