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Originally Posted by snafle
Plane systems are so well shielded it doesnt really make a difference unles you are really close to them, anyway. The banning of mobile phones is more because (1) they are useless at crusing altitude anyway, and Just In Case. Switching a phone on will not cause the plan to crash, an airplane full of peopl with their phones on and bluetooth on COULD cause some interference.
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I have posted here on this subject before, and I can tell you, without question, that some cell phones DO cause interference with the radios in some airliners. I know, becasue I fly one. Sometimes when we up front forget to turn off out phones (hey sometimes it happens

) we can hear things in our headsets when we get close to the ground as the phone picks up a signal, or you get a text, etc. Don't turn the thing on in flight for grins just to see if it works. We can sometimes, and I repeat sometiimes, hear interference in our radios. There was a great article in a magazine or newspaper a few months back (I forget which one) which had several documented cases of flight control disruptions (ie autopilot disconnect, airplane following a false glideslope briefly, etc) due to what was believed to be cellphone or pager interference. I personally know of other pilots who have had similar occurances that after they made an announcement to turn off all electronic devices, the problems went away. These high speed internet offerings in flight are going to be great for the airlines and their passengers, but I do worry about the floodgates being opened to stupid passengers who will think since this is ok, then any device will be ok anytime. This simply isn't true.