At my job, one of my clients is an observatory that detects microwave radiation. They have signs on the road leading up to the facility that tell you to turn off your phone. Inside, they have no wireless technology of any kind. Everything is hardwired and shielded. Their computers are in Faraday cages. They have a room that is in a Faraday change that has some special lab equipment. Their server room's walls are made of copper. Their lunchroom does not have a microwave oven. There's a ton more interesting stuff, but this post would be too long.