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A telephone number is a sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN) or other private networks.
How to Find a Telephone Prefix for a City. A telephone prefix, also called a telephone exchange, makes up the second set of three numbers in a 10-digit phone number. For example, 555 is the prefix in the mock telephone number 202-555-1234. If the city you would like to know the telephone prefix for is local, that city's telephone prefix numbers will be in the introductory pages of the White Pages phone book. You can look up the prefix numbers there, or online.