On iOS hold vol up (or down) and power at the same time. It starts SOS but you can cancel. At this point Face ID is disabled and you must enter your pin to reenable it.
So yeah. As soon as you see lights, hit that cop button.
Just make sure you have all your docs on paper so you don’t have to open your phone.
Restart your phone beforehand so that it won’t accept biometrics
Both iOS and Android have Lockdown options, so that isn’t even completely necessary, granted it will also work.
Before the police pull you over?
On iOS hold vol up (or down) and power at the same time. It starts SOS but you can cancel. At this point Face ID is disabled and you must enter your pin to reenable it.
So yeah. As soon as you see lights, hit that cop button.
Just make sure you have all your docs on paper so you don’t have to open your phone.