Not too many years ago this was brought up at an IMAA event to me, some guy was having a freak out on the flight line because someone in the other station answered his cell phone. I went right over to Jim Giffin the district 10 VP and asked what the AMA stand on cell phones was. The testing done by AMA showed no problems at all. AMA has no rules regulating them. Jim on the other hand didn't trust them?? So far the tests I have seen show no trouble at all but if a club says no phones then no phones it is. This would have to be voted on by the club members depending on the by laws. This is also one of the times you will see more of the older members voting to ban something new to them, just the nature of the beast. I wasn't thrilled about them when they started showing up at the field either. So far the next time I see a problem with them will be the first. I no longer worry about them at all.