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 short while.
Afterwards press and hold together: Volume Up + Home + Power button for a couple of seconds.
When the Samsung Logo appears, you can release held keys.
In the next step select from 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".
Congratulations! Your cell phone is ready to use.
Start by turninng on the device by holding down the Power key for a few seconds.
From the Home Screen go to Menu and then to Settings.
In the next step tap Backup & Reset and then Factory data reset.
Afterwards choose Reset device.
To confirm your choice select Erase everything.
Well done! The hard reset has just been performed.
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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.