In order to hard reset a Pantech P4000, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Pantech P4000 device will be brought back to the default configuration of a brand new device.
1. Hold down the Power button until the phone turns on.
2. Starting from the Main Menu, select Settings, Privacy and Factory Data Reset.
3. Lastly, select Reset Phone and Erase Everything.
4. Voila. Wait for your phone to reset and restart.