Adequate insurance coverage, routinely purchased through one agent, can require several carriers if the home is in a hurricane or flood-hazard area.

The Federal Communications Commission requires carriers to continue to support analog networks, although in some cities only a few channels are available if a user has an analog phone.

Born of historical and technological differences, current regulations require telephone companies, or so-called common carriers, to provide their services on a totally nondiscriminatory basis.

It has also required carriers to meet a utilization threshold of at least 60 percent before they could receive additional numbers in their area.

The popular answer to this problem is to require that phone companies serve only as common carriers, regulated by the F.C.C.

Second, the FCC should require rate-of-return carriers to move to incentive regulation.

Although the Press never said flatly that children could not hold the jobs, it is requiring carriers to have "a dependable insured vehicle."

The creation of a master database of mobile phone numbers requires competing carriers to work together.

The FAA required commercial carriers to keep extraordinarily detailed maintenance records.

These types of transformation programs may require carriers to transition subscribers and commercial services from the legacy to the new networks.