Wingrider, what can a cell phone actually do to the plane?  A young man next to me on a plane turned on his cell phone and made a call while we were approaching the airport for the landing.  It made me nervous but I did not say anything because I didn't know what a cell phone can actually do to the plane's operation.  Someone once told me that cell phones really aren't going to cause a problem, the airlines are just being overly cautious.  I have no clue, so what is the truth about cell usage on a plane?  Thanks!