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1. Touch the Home key > > Settings > Security > Screen
lock.
2. Touch None, Long press, Pattern, PIN or Password.
Touch None to disable the screen lock.
Touch Long press to enable screen lock and allow
unlock with a ‘touch and hold’ gesture. You can unlock the
screen by touching and holding on the blank area of the
screen.
Touch Pattern to create a pattern you must draw to
unlock the screen.
Touch PIN or Password to set a numeric PIN or a
password that you must enter to unlock your screen.
NOTE:
If you forget the pattern you set, you can also upgrade the phone
software. See Upgrading the Phone Software.
Protecting Your Phone With Encryption
You can encrypt all the data on your phone: Google accounts,
application data, music and other media, downloaded information,
and so on. If you do, you must enter a numeric PIN or a
password each time you power on your phone.
WARNING!
Encryption is irreversible. The only way to revert to an
unencrypted phone is to perform a factory data reset, which
erases all your data.
Encryption provides additional protection in case your phone is