Many people believe that cell phone use is prohibited on planes to force passengers to use the ultra-expensive option of making an in-flight call from the phones provided on the airplanes. However, the FCC, which does not have a stake in the phones installed on planes, banned cell phone use on planes because of concerns that their signals could cause disruptions and interfere with aircraft navigation systems.
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I have been on smaller private planes, and it is obvious when someone has their phone on because it can be heard on the comms, much like you can hear the phone on your car stereo when its is too close. Now imagine you have 300 some people on the plane.