Seatbelt and No Smoking Sound doesn't always work.

Sometimes the seatbelt and no smoking sound doesn’t always play when activated for device “LG Optimus G LS970.”

you only hear it from cockpit view and heads up display view.

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You need speaker like these to hear it outside.
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Just joking, @anon66442947 was right, you need to be inside aircraft to hear it.

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