Comment by daemonologist

Regarding passcodes, for Android phones I've learned to avoid under-display fingerprint readers - they're okay for you and me but just hard enough to use that some people never converge on the right angle/pressure/duration combination to get them to work reliably. Several of my relatives have gone back to typing in their password (or to no password) after moving from a device with a back-of-phone to an under-display reader.