It will remove all the data ,contacts and apps that you installed
Begin by switching off the device by pressing the Power key for a short while.
Afterwards press and hold together: Volume Up + Home + Power button for a couple of seconds.
You can release held keys when the Android Robot appears on the screen.
Then select from Recovery Mode menu "wipe data / factory reset" using Volume buttons to navigate and Power button to confirm.
In the next step choose "Yes -- delete all user data" to confirm the whole operation.
When the Recovery Mode appears again on the screen select option "reboot system now".
Well done! The hard reset has just been performed.
Start by turninng on the device by using the Power button.
From the Home Screen go to Menu and openSettings.
Tap Backup & Reset and then Factory data reset.
In the next step choose Reset device.
To confirm your choice select Erase everything.
That's all. Your phone is ready to use.
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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.