Locking and unlocking the wireless device - Samsung SCH-u430

The Phone Lock feature, helps prevent unauthorized use of the 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.
To lock the phone:
- From the main screen, press OK to choose Menu.
- Select Settings & Tools then press OK.
- Select Phone Settings then press OK.
- Select Security then press OK.
- Enter the Lock Code (the default code is the last 4 digits of the cell phone number) then press OK.
- Select Lock Phone Now then press OK to immediately lock the phone.
For other lock options, select Phone Lock Setting, set the desired option then press OK:
To unlock the phone:
- From the main screen, press the left soft key to choose Unlock.
- When prompted to Enter Phone Lock Code, enter the 4-digit lock code (the default code is the last 4 digits of the cell phone number) then press OK.