It will remove all the data ,contacts and apps that you installed
Firstly, switch off your phone by using Power Button.
Afterwards press and hold Volume Up and Down buttons.
While holding these buttons push the Power key for a short while.
Release these buttons when your phone turns on and shows a text screen.
Choose "Factory reset" by using Volume Buttons to scroll and Power button to confirm.
After that, follow the instructions to complete the hard reset proccess.
Start by turning on your phone.
Tap Settings and then select About.
Afterwards, choose Reset your phone.
Confirm your choice by tapping Yes.
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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.