Hopefully you don't use your face, either. That's even worse since anyone can unlock your phone even if you're unconscious...
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I never use my face haha just good old passwords that even I donβt know why I picked π«π
That's just about the best way.
Here in the US, biometric locks are not protected by law due to some dumb reasons. I don't know what the laws are over in the UK about that.