The strength (and capability to interfere) of EM radiation is subject to the inverse-square law. You would cook yourself long before your phone could put out en

The strength (and capability to interfere) of EM radiation is subject to the inverse-square law. You would cook yourself long before your phone could put out enough juice to interfere with the cockpit. If you can disrupt a speaker's magnetic field by placing a phone 3 inches from it, then you would need 16,000 times as much power to perform the same disruption from 10 feet away. If every passenger in a 149-seat Boeing 737 had a cell phone, and you daisy-chained them all together to produce an EM pulse, you could improve your disruption distance to 3 feet without anything in between your output and the target to disrupt.