On that note: Reminder that the German police has been formally allowed to grab your hand and force unlock your cellphone with a fingerprint. Do not use fingerprint or facial unlock, it can be defeated in many ways. Do not rely on complex schemes like "hold power button to disable fingerprint" etc., which can be forgotten under adrenaline. Just use a PIN at all times. For now at least, they're not (officially) entitled to force you to say your PIN.
Also disable messages and notifications in the lock screen, the cops are known to watch it to mine for contacts. And don't unlock your phone around cops--I've watched it in person, they will yank it right out of your hand and dig through your photos and private messages, even without a warrant or anything.