Faraday cages don’t stop smartphones from taking pictures, removing the SD card to capture data, downloading via USB, or from connecting them to a network with a wiring closet that goes beyond the cage.
You are right about taking pictures with a smart phone. As far as USB ports, the military got burned by “Chelsie” manning, I would have to believe the military would have locked up all USB ports in a SCIF. DOS who knows. This group does not like to follow rules and be told what to do. They are above the law.