In android; there is also a ‘lockdown’ mode you can quickly activate from the power off screen, that disables Biometrics until next unlock with a pin/pattern, but doesn’t fully shutdown so you can still quickly access things like the camera. This has to be explicitly enabled in settings first and will not offer much protection from various lockscreen bypass software available to law enforcement.

2 things. Unless I accidentally enabled this setting, it’s on by default. And what do you mean by lockscreen bypass software. What would be the point of lockdown if its not effective against law enforcement trying to brute force your privacy?

My wife and I use SimpleX. I don’t know why its not discussed more. Perfect use case for attending protests and such. Get swept up in illegal arrests and they want you to open the app? Enter the self-destruct code. It opens the app normally while destroying any info it contained so they would be none the wiser. It just looks like an empty chat.

Pretty sure its under a more info dropdown