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

How To Hard Reset
Remember! All Data Will Be Lost, So Make A Backup Before!
1.Power Off Your Phone
2.Press Together Volume Up + Home Key + Power Button
3.Select With Volume Keys "Wipe Data/Factory Reset" And Press Power To Confirm
4.Select "Yes" And Press Power To Confirm
5.Wait Until Format Ends
6.Push Power Button To Confirm "Reboot"
7.Wait Until The Phone Restarts
Samsung Galaxy S5 Restore Factory Hard Reset Format Phone.So lets start the Samsung Galaxy S5 Restore Factory, Samsung Galaxy S5 Hard Reset.Turn Off the mobile phone for few mints.Samsung Galaxy S5 Remove Pattern Lock.
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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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