The Phone Lock feature helps prevent unauthorized use of the device by disabling user initiated outbound data and the ability to make calls. The device is still able to receive calls and place emergency 911 calls.
From the Main screen, select MENU.
Utilize the 5-way navigation pad to highlight then press the center/OK button to select.
Select Settings & Tools.
Select Phone Settings.
Enter the Phone Lock Code.
The default code is the last 4 digits of the mobile number.