In order to hard reset a Sony Ericsson G700, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Sony Ericsson G700 device will be brought back to the default configuration of a brand new device.
1. Turn on the device.
2. Starting from the Home screen, go to Menu > Settings > General > Master Reset.
3. Delete all user installed applications > Delete > Yes.
4. Lastly, enter the phone lock code and select Done.