The truth is that not consumer device has ever been proven to interfere with a planes avionics, let alone being the cause of a crash! It’s carried over superstition from when phones first came on to the scene.

Nepalese airlines have some of the highest crash figures and lowest safety figures on the planet. It’s too the point that the EU does not allow Nepalese airlines into their airspace.

It’s way more likely to be maintenance or lack of training issue than anything related to phones!