Lenovo TAB A7-40 User Manual page 23

Screen lock: You can unlock the display in one of four ways: Slide,
Face Unlock, Voice Unlock, Pattern, PIN and Password. You can
deactivate the screen lock as well by selecting None as well.
Tap Pattern, use your finger on the screen (as illustrated) to draw
an unlock pattern. Once you have set the unlock pattern, you will
then be able to toggle Make pattern visible on/off.
After you have set and activated the pattern unlock function, the
unlock keypad will be displayed whenever the display is to be
unlocked. Use your finger to trace your preset pattern on the
keypad. After the preset pattern has been correctly entered, the
screen will be unlocked.
Tap PIN to input the PIN code (minimum 4 digits) you will use to
unlock the display.
Tap Password to input the password (minimum 4 characters) you
will use to unlock the display.
*SIM CARD LOCK: Set up SIM card lock-related settings.