
Mobiles on planes
Yes, using your mobile phone mid-flight really could cause the plane to crash. The reason the Civil Aviation Authority, the British aviation regulator, prohibits their use on planes is the signal can interfere with the aircraft's communication and navigation systems. What happens is that, the more energy the phone uses to communicate with the mobile network 30,000ft below, the more likely its signal is to interfere with the plane's electronics.
What we are told less often is that the chance of that interference causing the plane to crash is minute - something you may have guessed the last time you furtively switched of your phone mid-flight, having forgotten to do so earlier. Some airlines are working on installing an independent network on the plane so your mobile can get a signal with minimal effort, reducing any risk. In the meantime, though, the authorities would rather err on the side of caution, so the rule stands.

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