I ran across this tweet by Don Van Natta, Jr:
DVNJr Don Van Natta Jr.
Just had a guy try to rip my iPhone out of my hands outside Penn Station. He failed. Try to take my iPhone and you're going to get hurt.
That happened not on Christmas day, today, but on December 21st, but it's still wrong.
Apple needs to build-in voice recognition software that periodically checks in with the user. That way, if someone does steal an iPhone, and it "recognizes" that the user is someone else, the phone will just shut down.
That aside, the person who tried to take his iPhone learned a hard lesson: don't mess with an iPhone owner.