Yealink SIP-T38G - Manual (Page 39)

Customizing Your Phone
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To set the keypad lock PIN via phone user interface:
1. Press Menu->Setting->Basic Settings->Phone Unlock PIN.
2. Enter the Current PIN, New PIN and Confirm PIN in the corresponding fields.
3. Press the Confirm soft key to accept the setting or the Back soft key to cancel.
To activate the keypad lock via phone user interface:
1. Press Menu->Setting->Advanced Settings (password: admin) ->Phone
Setting->Lock.
2. Press or , or the Switch soft key to select the desired type from the Keypad
Lock field.
3. Press the Save soft key to accept the change.
4. Long press to lock the keypad immediately when the phone is idle.
The LCD screen prompts “Keypad Locked!” and displays the icon .