It will remove all the data ,contacts and apps that you installed
In order to turn off the device press the Power button for a while.
Afterwards press and hold together: Volume Up + Home button + Power button, until you see Samsung logo.
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.
After that select option "reboot system now".
Well done! The hard reset has just been performed.
Start by turninng on the device.
From the Home Screen go to Menu and then to Settings.
Tap Backup & reset and then 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.