is this really an issue
I thought all testing had proved mobiles don't interfere so am surprised they cared about this. Afterall people accidently leave mobiles & Blackberrys on all the time on flights and I've not heard of an incident.
Personally I like the ban for the peace and quiet. Who would want to listen to people all shouting into their phones especially half the plane saying "I've just landed".
Fair play to the pilot for being so honest throughout though.