So I was thinking about this after a friend had their phone stolen and couldn't do anything with Find My iPhone to recover it, as the thief wiped the phone too soon (excuse it being a collection of notes...). I present to you - Theft mode: Tap home button 5 times (easy enough when getting robbed?), power button will not allow you to turn off, cannot use home+power to restart, cannot put into DFU, cannot go into airplane mode, location services come on. Messages, email, phone, safari, photos, music all get new database files and the 'new user' can use the phone as before. Find My iPhone will find the phone, once you see it, can alert police and recover phone with a full SWAT team, hopefully shooting the robber in the face. Can turn off in Find My iPhone too if done by accident. SIM card still a problem. Verizon & Sprint should be ok with this though.