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

If You Forgot Your Unlock Pin Code Just Follow These Steps To Reset Your Phone.
1.Powe Off Your Phone
2.Push Together Volume Up + Home Button + Power Key
3.Select With Volume Keys "Wipe Data/Factory Reset" And Push Power To Confirm
4.Select "Yes"
5.Wait Until Format Ends
6.Push Power Key To Confirm "Reboot"
7.Wait Until The Phone Restarts
Done :)
Samsung Galaxy S3 I9300 Restore Factory Hard Reset Format Phone.So lets start the Samsung Galaxy S3 I9300 Restore Factory, Samsung Galaxy S3 I9300 Hard Reset.Turn Off the mobile phone for few mints.Samsung Galaxy S3 I9300 Remove Pattern Lock.
Sign up here with your email
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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