The screen protector is an accessory developing along with smart phone. The screen surface of early smart phones (to be precise, the protective glass above the screen panel) is flat. It is also a so-called “2D” screen (glass), the frame is parallel, or the screen is wrapped in the frame.
Lockdown Mode is the first major capability of its kind designed to offer an extreme, optional protection for the very small number of users who face grave, targeted threats to their digital security.