It will remove all the data ,contacts and apps that you installed
Turn on the tablet.
Now goto Menu -> Settings -> Backup & reset -> Reset device -> Erase everything.
Next you will see that you tablet will reset and restarts.
Switch off your device.
Then press and hold this buttons: Volume Up + Power button + Home button.
Now you will see Recovery mode menu.
Next choose option "wipe data / factory reset" using Volume buttons to scroll and Power button to accept your choice.
After that select option "Yes -- delete all user data".
In the end press Power button to confirm option "reboot system now".
Samsung Galaxy Tab 3 T315 Restore Factory Hard Reset Format Phone.So lets start the Samsung Galaxy Tab 3 T315 Restore Factory, Samsung Galaxy Tab 3 T315 Hard Reset.Turn Off the mobile phone for few mints.Samsung Galaxy Tab 3 T315 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.