why does my finger print sensor only unlock the phone when the sceen is on? The under optical display finger print does it well but my z fold 7 button needs to first turn it on then unlock.
If by 'black screen', you mean when the phone is not on and the display comes on by pressing the side button, then all you have to do is go to settings - security and privacy - biometrics - finger prints - Finger print always on: make sure this is on, then you can unlock the phone even if the display isn't on.
If by 'black screen', you mean when the phone is not on and the display comes on by pressing the side button, then all you have to do is go to settings - security and privacy - biometrics - finger prints - Finger print always on: make sure this is on, then you can unlock the phone even if the display isn't on.