https://marco.org/2007/07/25/now-its-common-knowledge-that-your-cell-phone-can
Now it’s common knowledge that your cell phone can bring down an airliner. But if that were true, the airlines would confiscate your phones, not just ask you to turn them off. And given the fact that at least one moron leaves his phone on during every flight, you’d expect at least one cell phone-related crash. I’m still waiting.