Most of us are familiar with the standard warnings and regulations against passengers using electronic devices (at all during takeoff and landing, and in some cases throughout the flight). This is based on a concern that sensitive avionics or aircraft radio equipment could be affected by interference from devices being used by passengers.
Has a commercial flight ever crashed as a direct result of a passenger using an ordinary consumer-grade electronic device during the flight? More specifically, has there ever been a crash investigation where the conclusion was e.g. that the plane wouldn't have crashed if the passenger in seat 5-F had turned off his Game Boy before takeoff?
To be clear, I'm not asking about why there are electronic device regulations or safety guidelines. I'm asking if these guidelines are purely theoretical (we're pretty sure that using them could cause a crash, even though it's never happened) or if there have been actual crashes due to device usage.
Also to be clear, I'm asking only about ordinary, consumer grade electronics (e.g. phones, laptops, tablets, beepers, walkie-talkies, video game consoles, etc.), rather than military or industrial equipment.