Cell phone numbers are categorized like traditional landline numbers. Each number has a three-digit prefix (also known as an exchange) that follows the area code. Cell phone carriers own the exchanges in which they assign numbers. With a few mouse clicks it is possible to crack this code to determine which cell carrier owns a number.
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Find the cell number that you want to look up, including the area code.
Go to the Fone Finder website (see Resources) and enter the number as directed.
Fone Finder will return the name of the telephone company who owns the number, along with its geographical location.