And on current GrapheneOS: * Lockdown (require PIN to unlock) -- Hold power button 1 second, then tap Lockdown icon on screen. * Call 911 -- Click power butto

And on current GrapheneOS: * Lockdown (require PIN to unlock) -- Hold power button 1 second, then tap Lockdown icon on screen. * Call 911 -- Click power button 5 times, then don't slide to cancel in the 5 second delay. * Camera -- Click power button 2 times. (If you invoked this while at lockscreen, you'll be restricted to Camera and recent Gallery, AFAICT.) So, if you're at, say, a heavy-pickpocketing tourist attraction, or high-risk mugging neighborhood, then you might switch your phone to Lockdown, and use this restricted Camera mode when you want to take photos. Then someone just grabbing the phone will still get the phone, but at least not likely be able to access your accounts. (Though, if they try to force your finger or face to the screen, then you might need to calm them down, as you type in your PIN.)