Trope: Police have to keep bad guy talking on the phone long enough to trace them and find their location. Professional bad guys hang up right before it triangulates their coordinates.
Apparently, Hollywood’s been getting this inspiration from a pre-digital age when they use this trope in movies. See link for more info. It’s just funny that most of the “tracing the call” scenes I’ve seen are definitely after the 2000’s.
Another link: https://slate.com/news-and-politics/2002/10/how-hard-would-it-be-to-trace-the-sniper-s-phone-calls.html
A fun gif: https://i.gifer.com/9QtC.mp4
The issue was more that they needed to identify only the ones that illegally entered the premises, and separate those from people legitimately working there. They then had to cross reference those IMEI/MACs to camera footage of them illegally entering the building. Some of those dipshits were ID’d and picked up immediately, others used burners and covered their faces with masks (ironically) and had to be tracked similarly to how Luigi was caught; establishing a timeline of events with that same individual using other cameras in the area until you find one of them without a mask on.