[ZOA NOM]

The frequency spectrum for cellular phone use is way up in the UHF band, above 800 Mhz. The spectrum assigned to ATC is in the VHF range between 108 - 132 Mhz. Because of the selectivity requirements in the communication equipment, there is very little chance for a cell phone to interfere with ATC communication. There can be harmonic affects, however, that might explain some of the clicking described by a pilot earlier.