Doing it like a BIOS is near impossible on commercial phones since apps don’t have access to that kind of functionality.

However, what we CAN do is to have the phone lock when it starts up. Currently we only have the option to automatically lock when the SIM is changed. We could add this as a setting. Pls vote it up if you think it should be implemented.

This seems to be a much requested feature through official support channels. Pls vote it up if you think it should be done