Why do cell phones not work in tunnels?

How are cell phones dangerous? What does the Oceanup website specialize in? What questions should i ask before having a cone biopsy? What is an old name for a toilet? What is the phone number for Lab Corp legal department? Why would water gurgle and spit out of the bathroom sink and tub drain when you try to flush and plunge the toilet but the toilet will not completely flush even when you plunge it? How do you set up the phone using one SIM on a dual SIM phone? What is 181 500 in words? Why won't my submersible well pump not turn on? What term is used to describe good manners when sending emails? Is it true that you can get free membership off of a Tinkerbell game? Why do people rickroll? Ipod touch 8gb a1288 2g or 3g? How do you set up ring tone for incoming text messages on the ace? What colour are not use in thr neutral wire? What is the latest Google algorithm update From where you find it? Can a net 10 prepaid sim card work in a t mobile prepaid phone? How do you get all the golden egg? What does esn mean? What was the importance of Morse code in the civil war?