It will remove all the data ,contacts and apps that you installed
At the beginning, turn off the phone by holding the Power button.
Then press and hold Volume Up + Home + Power button until you see logo of your phone.
When you see the Android Image menu release held buttons.
In order to enter the Recovery Mode hold down the Power key for a short while.
Afterward 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".
After that select option "reboot system now".
Success! The hard reset has just been performed
Turn on the phone by using the Power button.
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.