The invention is to provide a method enabling mobile telephones to have automatic multiple telephone number dialing capability to a same called party consisting of establishing a database recording a plurality of telephone numbers of a called party set by a user in a telephone directory stored in a memory of a mobile telephone; automatically searching the said database to determine whether the said called party has other telephone numbers when detecting that the line of one telephone number of the said called party being dialed is busy; and listing all the other telephone numbers in the said database belonging to the said called party on a screen of the mobile telephone for selectable dialing, thereby effectively reducing the time spent on user searches for other telephone numbers as well as the annoying dialing of other telephone numbers.