Flyboy,
Thank you for stepping up here. As I have said earlier, some things get wrongly blamed for causing interference and then everybody runs around blaming crashes on it. Cell phones aren't even close to our frequency. If you want some really mind numbing research check out the FCC frequency distribution;

[link]http://www.ntia.doc.gov/osmhome/allochrt.pdf[/link]

Now with that being said, I just hung up the phone with Steve Kaluf who is the technical director at the AMA. The conversation boiled down to him saying that the AMA did do research on this when cell phones first came out and they found that cell phones don't cause interference for our planes while they are on. He did mention that there is a slight chance of a cell phone close to a micro-processor controlled transmitter that is TURNED OFF and the cell phone rings there is a small chance it could damage your chip in your transmitter, but today's transmitters have shielding for the chip to help prevent this and he also said that this WON'T happen if the radio is on. Steve was very helpful in his conversation and I don't want to misquote him. He said he would be more than happy to talk to anybody out there that still thinks cell phones can cause interference. His email address is [email protected] or you can call him at (765)287-1256.

My conversation with Steve was to back up what I already know, cell phone WILL NOT cause interference in our radios. Our radios work in the 72 MHz frequency ranges. Some older cell phones work in the 900 MHz & 1400 MHz range, but most modern phones are actually pushing the 2.4 Ghz range (that is 2400 MHZ to keep units the same). No matter what others say the have "found" or "seen" it's just not possible to for them to interfere. I for one have no fear of hanging my phone on my belt while I fly. My phone rings all the time while I fly (no, I don't answer it until I land) and it has NEVER caused any problems.