It will remove all the data ,contacts and apps that you installed
The device must be turned off so hold down the Power key for a few seconds
After that, press and hold together: Volume Up + Volume Down + Power button for a couple of seconds.
You should release Power key when the Samsung Logo appears on the screen.
Then select from Recovery Mode menu "wipe data / factory reset" using Volume buttons to navigate and Power button to confirm.
Choose "Yes -- delete all user data" to confirm the whole operation.
When the Recovery Mode appears again select option "reboot system now".
Well done! The hard reset has just been performed.
Start by turninng on the device by using the Power key.
From the Home Screen go to Menu and then to Settings.
Tap Backup & Reset (Privacy) and then Factory data reset.
In the next step choose Reset device.
To confirm your choice select Erase everything.
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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.