We asked the flight attendant one time why phones had to be turned off during take-off and landing and she said it had nothing to do with the signals interfering with the plane's controls. She just said that it cost the airline money for cellphone service providers. I don't really know how or if that's even true, but I doubt it messes up anything. My family (and others, I'm sure) still use our phones when we're taking off and landing and nothing has happened.
If you don't want to click: BUSTED
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"Explanation: Never mind what the chatterbox in the seat next to you says about cell phones messing with plane navigation — those metallic birds are built airtight against foreign signals and operate on entirely different frequencies than cell phones.
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So why all the fuss about phones? When you make a call at 10,000 feet, the signal bounces off multiple available cell towers, rather than one at a time. That means too many phone-happy jetsetters might clog up the networks on the ground, which is why the Federal Communications Commission (FCC) — not the Federal Aviation Association (FAA) — banned cell use on planes."
You used to not be able to use it on the plane because it would interfere with the pitot static instruments. But all modern air craft are equppied with Glass cockpits so the ban (which was recently lifted) has been out dated for some time. The reason for the take off and landing still being around is, those are the most critical phases of flight and they dont want the potential projectials around the cabin (same reason your bags have to go UNDER the seat). Now you know.
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"Explanation: Never mind what the chatterbox in the seat next to you says about cell phones messing with plane navigation — those metallic birds are built airtight against foreign signals and operate on entirely different frequencies than cell phones.
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So why all the fuss about phones? When you make a call at 10,000 feet, the signal bounces off multiple available cell towers, rather than one at a time. That means too many phone-happy jetsetters might clog up the networks on the ground, which is why the Federal Communications Commission (FCC) — not the Federal Aviation Association (FAA) — banned cell use on planes."