Google Lock is also named FRP(Factory Reset Protection). This is a new security lock using on Samsung device. If your phone has activated Google Lock, that means after factory reset your Samsung, you need to pass the Google account verification that you used on your Samsung device before to set up. If you don't remember, that will be a complicated way to bypass Samsung Galaxy. But the another great feature of 4uKey for Android is to help remove FRP lock on Samsung devices.