I'm about to take a plane trip to my dads house but I'm just curious why you must have airplane mode on?

I'm no aviation master here, just looking for information.

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    $\begingroup$ To avoid interfering with aircraft systems. $\endgroup$ – Ron Beyer Dec 26 '16 at 14:46
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    $\begingroup$ No, WiFi and Bluetooth both use transmitters. Airplane mode means airplane mode and switches off all to the phones' radios. $\endgroup$ – Simon Dec 26 '16 at 16:41
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    $\begingroup$ @Simon This works for me as well when I switch to airplane mode (which at first turns off any transmission) and then selectively turn WiFi on again. Then I have airplane-mode minus WiFi, i.e. WiFi works, but nothing else. I have a Moto G1 if that helps, but I'd expect other phones to behave similar when I explicitely override AP mode. $\endgroup$ – PerlDuck Dec 26 '16 at 20:13
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    $\begingroup$ @Simon My experience mirrors that of PerlDuck: airplane mode initially turns off Bluetooth and WiFi, each of which can be subsequently enabled and used whilst in airplane mode. This has been my experience with two different generations of Samsung Galaxy and a Moto X. I will further point out that the US airlines that instruct passengers to use phones only in airplane mode also advertise and encourage use of the in-flight WiFi. $\endgroup$ – J Walters Dec 26 '16 at 20:27
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    $\begingroup$ Anyway I got off the plane thx guys $\endgroup$ – Piggyuniform Dec 26 '16 at 20:33