Hi gIn. My name is NET10 Marianne. Let me help you. Kindly follow the instructions below and see if it works.
1. From the main screen, press the "Menu" icon located at the lower right hand corner of your screen.
2. Press the "Settings" icon.
3. Press "Phone."
4. Press "Auto-Lock."
5. Press the time you would like to set the auto-lock to. You can choose "Never" so your phone will not automatically locked when in idle mode. "Saved" will appear on the screen.
6. To return to the main screen, press the red END key.