As an instrument rated pilot myself and as as the original poster I do NOT believe electronics cause any problems and if I had to guess this problem was cause in the ground or with the airplane, not with anything passengers did.

The pilot said the problem was with the COM radios, not the GPS or ILS (instrument landing system). My un-expert opinion is that cell phones had nothing to do with this, but it did make me wonder enough to ask the pilot what would cause him to worry[?] that much.

I do think cell phones / voice can eventually be allowed on-board. HOWEVER, technology needs to be developed (and I believe it can) so it is not disruptive to other passengers. I hope that generic laws preventing the market from developing technologically are NOT passed.