olemus
mobiiltelefoni pääsumehhanism,
mis nõuab autentimiseks PIN-koodi
= a mobile phone access control that requires a PIN for authentication

ülevaateid
https://www.makeuseof.com/tag/lock-methods-android-phone/

https://support.oppo.com/en/answer/?aid=neu88

https://www.somagnews.com/open-pattern-password-pin-lock-android/

https://joyofandroid.com/how-to-unlock-android-phone/