Re: This explains it
"Who knew these cop shows would turn out to be so realistic?"
On the other hand, Person of Interest - an excellent show - very much underplayed how easy it is with the right skills and tools to compromise a smartphone, making the show's limitations far greater than real life.
Maybe the didn't want to scare people, or maybe they thought people wouldn't be able to (or want to) accept such an obviously 'fictional' ability.