It will remove all the data ,contacts and apps that you installed
At the beginning switch off your mobile phone by holding down the Power rocker for a short while.
Afterwards press and hold together: Volume Up + Home + Power button for a couple of seconds.
As soon as the Samsung Logo appears release held keys.
In the next step select from menu "wipe data / factory reset" using Volume buttons to navigate and Home button to confirm.
Choose "Yes -- delete all user data" to confirm the whole operation.
After that select option "reboot system now".
Well done! The hard reset has just been performed.
Start by turninng on the device by holding down the Power key.
From the Home Screen go to Menu and then to Settings.
Tap Backup & Reset and then Factory data reset.
Afterwards choose Reset device.
To confirm your choice select Erase everything.
That's all. You have just performed the hard reset operation.
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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.