Whilst there is no definitive proof that mobile phones interfere with airline systems, where trials have been conducted, shielding has been installed to protect sensitive avionics, as there is a theoretical risk. There is also a theoretical risk that a mobile phone could be hazardous at a gas filling station, and they are banned for the same reason.
Of course, as soon as a model is developed which will generate revenue for the airlines if they allow them, they will suddenly discover that the safety issues can be overcome. It's a miracle!!
In fact, in the future, the "flybywire" design of most modern aircraft will be replaced by lower weight "wifi" communications which will considerably reduce the cabling weight on future aircraft. You can be sure if this was not possible to be done safely, this would not be in the design stage.
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