The Phone Lock feature helps prevent unauthorized use of your device by disabling outbound data and voice calls. The device will still be able to receive phone calls and place emergency calls to 9-1-1.
Press the left soft key for Menu.
Utilize the 5-way navigation pad to highlight then press the center/OK button to select.
Enter the Phone Lock Code then select OK.
The default lock code is the last 4-digits of the mobile number.