1.   Do you use a carrier.

2.   Do you use a carrier?

3.   Because customers must dial extra digits if they use a long-distance carrier for such calls, Ameritech has been able to keep toll calls almost exclusively to itself.

4.   Besides preventing Airtouch from offering its own long-distance service, the ruling would mean that it must allow its cellular customers free choice in which long-distance carrier they use.

5.   By dialing an access code, customers can use any carrier, however.

6.   Callers can chose which long-distance carrier they use by dialing a code before the telephone number.

7.   Expedia then offers flight times, using a carrier that remains anonymous until the package is purchased.

8.   For example, the company now calculates the efficiency of using different carriers to send packages to different regions, rather than depending on one carrier.

9.   He says his company avoids using wireless carriers that charge their customers for each e-mail.

10.   If consumers used private carriers, such as UPS, they had to check with the tax agency to make sure their returns reached the processing center on time.