It will remove all the data ,contacts and apps that you installed
Turn off your phone.
Press and hold together Volume Up + Home button + Power button.
Then release them, when you see logo Samsung.
Choose option from the menu "wipe data/factory reset", using Volume buttons, and confirm with Power button.
Next select "yes" with Volume Down and confirm with Power button.
After this operation select "reboot system now".
Switch on your cell phone.
Then navigate to Settings -> User and Backup -> Factory Data Reset.
Accept all information on your screen.
Power on the phone.
Dial or press number to call: *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.