Airplane mode turns off the radios on the phone. They want you to do that for a couple reasons. First, they just don’t want you making calls in flight because it’s annoying and because it can distract you when you should be paying attention for safety reasons. Second, having hundreds of cell phones whizzing by at hundreds of miles an hour from a position where they can reach dozens of cell towers at the same time can mess with the mobile phone network.
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