It will remove all the data ,contacts and apps that you installed
Turn on your device.
Now goto Settings -> User and Backup -> Factory Data Reset.
Confirm all information on your screen.
Switch off the cell phone.
Then hold and press 3 keys: Volume Up + Home button + Power button.
Next release all keys, when Samsung logo appear.
Select option "wipe data/factory reset" using Volume Down button, and confirm with Power button.
Choose "Yes -- delete all user data" form the menu, and confirm with Power button.
After that select "reboot system now".
Power on the phone.
Next just type thid secret code: *2767*3855#
That number code will force format on device.
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Restore Hard reset will set your phone in origional factorry settings. It will remove all the data and apps that you installed. Your contacts will be removed and you have to add them again.