This article explains how to enable Lockdown mode on any Android smartphone. The instructions work for devices from most major manufacturers, but some Samsung Galaxy phones may need to enable Lockdown through the power menu.

To enable Lockdown Mode, simply select it from the Energy Options menu.

Press and hold the power button on the side of your Android phone. Hold it for a few seconds until the Power Options menu appears.

Select Lockdown from the options. It is labeled as such below the button, while the button itself has a small padlock icon.