These same “top secret” case solving techniques are shown on shows like Blue Bloods, etc, every episode.
Nothing new to folks.
That’s fiction though, here they can see it IRL.
If this guy had been aware and believed the fact that his phone was what was so easy for them to track him down with, do you think he would have had it on like he did? Next guy sure as hell won’t is what I’m saying, because they can see first hand how it was being used.