Does this exist? Good idea, but to work the attacker would need to keep cellular service turned on. With #GOS you can set up separate user profiles to 'hide' sensitive app's or data. Plus they have recently introduced a duress pin, which wipes the phone if entered.
Discussion
Yeah just an idea, doesn't exist. I thought Graphene did have that duress feature, I was just thinking of a way to do it remotely if you didn't have time. Graphene is looking like a good bet.