I'm with you there Cam!
Don't know if you have been to the Hospital lately, but I have.... and cellphones don't work inside the structure. They have jammers installed that prevent your phone to acquire a carrier signal. Some things there don't like interference and that is what the facility has had to do to prevent someone raising hell with essential equipment.... like the one that might be keeping your heart beating! My Son works for the school district and they are considering doing something similar in the middle and high schools to help students stay on task. Eventually I could see industries either requiring you check your phones at the door (like handguns in a Saloon), or blocking them out electronically. You can bet it costs millions annually in lost productivity!
Too bad though... they do have their use and are an effective tool in business, and social situations.
Take Care;
Doug