How to lock Panasonic phone

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To switch off handset, press and hold red ON-OFF button for 4 seconds. Panasonic KX-TCD/TG 151, 181, 820, 810, 831, 910 handsets: To lock a keypad press and hold the middle joystick for 3 seconds, to unlock keypad press and hold the same joystick for 3 seconds.

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