phone number description
phone number. String of specific numbers that a telephone or cell phone user can dial to reach another telephone or mobile phone. In the US, a phone number consists of 10 numeric digits, and sometimes requires dialing a 1 (the US country code) before the 10 digits. The first 3 digits are the area code, which are unique to a geographical location, and then the remaining 7 digits are unique to each device or user.