[ErVikingo]

I don't know if they cause interference but I really hope they are never allowed for a couple of reasons,

first, it is the only time I can have some peace and quiet from my phone and blackberry. I actually cherish my 8-9 hr flights as a refuge from data overload and

second, I could not stand the noise level in the cabin with tens of people yapping away. Not even my high tech Sony noise cancelling in ear headsets and Ipod could muffle.