It will remove all the data ,contacts and apps that you installed

To perform a factory (hard) reset:
Go into Settings > Privacy > Factory data reset.
To perform a hard reset using the buttons:
Switch off the phone, take out the battery and reinsert back in.
Hold the home and volume down button.
Hold the power button until phone turns on.
Follow the instructions on-screen.
BT THERE no written wht press wip date
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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.
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