Yealink SIP-T29G User Manual page 67

If it is set to other values except 0 (e.g., 5), the phone will be locked when the phone is
inactive in idle screen for the designated time (in seconds).
Press the Save soft key to accept the change.
6.
When the phone is locked, the LCD screen prompts "Phone locked." and displays the
icon .
To change the phone unlock PIN via phone user interface:
Press Menu->Basic->Change PIN.
1.
Enter the desired value in the Old PIN, New PIN and Confirm PIN field respectively.
2.
Press the Save soft key to accept the setting or the Back soft key to cancel.
3.
Note
The unlock PIN length must be within 15 digits.
Customizing Your Phone
55