The main reason is that the passengers should be attentive when announcing important information. However, according to one pilot, when all passengers have switched on their mobile phones, interference with the radio signal may occur.
So you'd rather turn it off after all?!?
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but everyone anyway listens to music so attention is gone
i heard reason is that phones can make plane's navigation work worse
Yes, we should switch off our smartphones just to be on the safe side.