<P> Telephone numbers in Puerto Rico are assigned under the North American Numbering Plan (NANP). </P> <P> Prior to March 1, 1996, Puerto Rico was one of many Caribbean islands served by area code 809 . On that date Puerto Rico was assigned the new area code 787 (with the mnemonic PUR or PTR). Permissive dialing of 809 ended January 31, 1997 . </P> <P> As elsewhere in the NANP region, increasing use of modems and mobile telephones strained the supply of seven - digit numbers within area 787, and an overlay plan came into effect in or about September 2001 . Puerto Rico now has two area codes, 787 and 939 . The new code is used mostly for wireless phones . </P> <P> Because of the overlay, the area code must be dialed for all calls . </P>

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