It will remove all the data ,contacts and apps that you installed
First of all switch off the phone by using the Power button.
In the next step press and hold together: Home + Power key.
You can release held keys when the Recovery mode appears on the screen.
Then select "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.
If the display is off, hold down the Power key to turn it back on.
From the Home Screen go to Menu and then to Settings.
Tap Privacy and then Factory data reset.
Afterwards 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.