The Drake Equation is a thought problem created in 1961 by Astronomer Frank Drake to produce a number meant to indicate how many intelligent and detectable civilizations may exist in the Milky Way galaxy which is our home in the Universe.
Go ahead, try it. Step outside tonight and glance skyward, pick any star and then visualize its own rocky, Earthy little ball orbiting around it, with some form of life potentially dancing a tango on top.
Your cell phone is very unlikely to cause a crash, but look at it from the FAA's perspective. There is a very, very small chance that the seven seconds it takes to turn off your phone and the 30 seconds it takes to turn it back on could save 300 lives.