Why can't we use cell phone while flying in a plane?

so I'm watching CNN and I saw this story that a man was charged after using a cellphone during a fliet(when the airplane was flying)so why can't we use cellphone when airplanes are flying???

it interfers with navigatrional equipment and radio instraments

Ya well I misspelled it
Actually the Fcc made it illegal to do so. . . .

The reason why we can't use cell phones on airplanes is because they tend to interfere with the equipment and, also they interfere with the pilot's radios.
The airlines tell you as soon as you board the plane that all cell phones, beepers, ect. should be turned off while in the air. You can turn your cell phone back on when you arrive to your destination.
Hope this helps.

You can't really use your cell phone that well on a plane anyways. Most provides will have no service in the skies because your way above the reach of there cell towers. Its like trying to climb a huge mountain and expecting to have service. Won't happen