Remote Battery Vampire

I was thinking about the near-future day when the guy in front of me on the plane not only lowers his seat into my lap five minutes into the flight but does so while beginning a six-hour conversation on his cell phone or VOIP connection. Are small but potent electromagnetic pulse generators forbidden on commercial flights? I mean if you can’t use them in front of row 10 or whatever lest the compasses in the cockpit point backwards, I would totally understand. But, you know, the cell phone thing is going to be really annoying.