To prevent disruption to the cellular phone network from the effects of fast-moving cell phones at altitude (see Technical discussion, below), the FCC has banned the use of mobile phones on all aircraft in flight.

The ban on in-flight phone calls is enforced by both the FCC and the FAA for a combination of technical, safety, and social reasons. Technically, the FCC (Federal Communications Commission) prohibits cellular calls because a fast-moving aircraft at 35,000 feet can "ping" multiple ground towers simultaneously, potentially overwhelming the cellular network on the ground and causing interference with other users. From a safety perspective, the FAA is concerned that active cellular signals could interfere with the aircraft’s sensitive navigation and communication instruments, though modern planes are much better shielded than they used to be. However, the most significant "modern" reason the ban remains in place is social harmony. Flight attendants' unions and the majority of the traveling public strongly oppose allowing calls because the prospect of being trapped in a middle seat next to someone shouting into their phone for five hours is considered a major safety risk for "air rage" incidents and cabin conflict.