So you want to reset your iPhone to the original settings from the factory? Well this quick tutorial will help you do just that!
Go to Home Screen
On the applications page click on Settings
Then click on the General Tab
At the bottom click ‘Reset’ key
Various menus come up, either some reset or the entire phone.
So, hit ‘Erase All Content & Settings’. Say okay on the confirmation dialog and it will take a few minutes to reset.