It will remove all the data ,contacts and apps that you installed
Please power on your handset.
Then tap Menu -> Settings -> User and Backup -> Factory Data Reset.
Now you should to confirm all operations.
Remove and insert the battery.
Then press and hold 3 buttons: Volume Up + Home button + Power button.
Next if you see menu, release the holded buttons, and select option "wipe data/factory reset" using Volume buttons and confirm with Power button.
Now confirm operation "Yes -- delete all user data with Power button.
Select option "reboot system now".
Turn on your phone.
Now please type this code: *2767*3855#
Afterwards your cell phone will reset and reboots.
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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.