Telephone number directory

摘要

A phone number database has a first group of memory locations with associated speed dialing facility and a second group of memory locations without speed dialing facility. A phone number may be provided with speed dialing facility when this phone number is already stored without speed dialing facility in the second group by indicating the phone number whose speed dialing status is to be changed, indicating a memory location with a phone number with the desired speed dialing status, and interchanging the speed dialing status of the two phone numbers. <IMAGE>