OK,my 2 cents-All radio transmitters emit a signal on their assigned frequency,ie 72 mhz-but they also emit harmonics which are usually in relation to their assigned freq.
In other words,a transmitter on 72 mhz will emit a harmonic signal at double that,triple,half ect.If the cell phone signal is at or close to a multiplier of 72mhz then interference is POSSIBLE.
Just my opinion as a former cb radio enthusiast