It will remove all the data ,contacts and apps that you installed
At the beginning, turn off the phone by holding the Power button.
In the next step hold down the Power key.
After a 2 seconds, while holding the Power key press and hold the Volume Up + Home button for a few seconds.
You should release held buttons the Recovery Mode menu appears.
Afterwards from the menu choose "Wipe Data/Factory Reset" by using Volume buttons to scroll and Power button to select options.
Confirm the whole operation by tappinng "yes".
Select "reboot system now" to restart the phone
Success! The hard reset has just been performed
If the display is off, press the Power to turn it back on.
Find and select Settings and then go to User and Backup.
Tap Factory Data Reset
Confirm all information on your screen.
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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.