You just need to fool them for a few minutes until the mugger runs off. Everything could kick in after that or you could determine when the device has moved a s

You just need to fool them for a few minutes until the mugger runs off. Everything could kick in after that or you could determine when the device has moved a significant distance after the duress password has been entered. In that short a time, your exposure is relatively limited. They can't get everything, and you could always record activity and use the network (that's still secretly active) to record what apps were opened during the exposure period, take periodic low-res screenshots that would show exactly what they were viewing, or even take a few mugger selfies. Upload it all in the background and send an email with everything the police might need to catch the little perp. No mugger is going to stick around longer than they have to. The need to get away quickly would dictate the design choices for such functionality. Maybe we'll get lucky and a few security developers at Apple/Google/etc. will read this discussion and get some good ideas to think about :).