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Rebooting does that by default on android: it always requires your pin. No need to remember to press the x button n times. Just shut it down.

A good habit anyway: you don't want them to be able to poke the ram.

Rebooting resets the passcode requirement on iOS as well.

If they tell you to unlock it but you 5 tap instead, then it wouldn't surprise me if it counts as obstructing justice.

You'd need to do it quickly before the cuffs come on. And make sure the officer doesn't mistake you reaching for your pocket as you grabbing your gun.

If you enable voice control in accessibility you can reboot the device using a voice command “reboot this device”.

After which you will need your passcode/word to unlock the device. Handy if you foresee a time you won’t be able to reach your device and tap the unlock button 5 times.