<Tr> <Td> Turks and Caicos Islands </Td> <Td> 649 </Td> <Td> </Td> </Tr> <Tr> <Td> United States </Td> <Td> 201, 202,...989 </Td> <Td> </Td> </Tr> <Tr> <Td> United States Virgin Islands </Td> <Td> 340 </Td> <Td> </Td> </Tr> <P> The structure of the North American Numbering Plan permits implementation of local dial plans in each plan area, depending on requirements . When multiple NPA codes serve an area in an overlay arrangement, ten - digit (10D) dialing is required . Seven - digit (7D) dialing may be permissible in areas with single area codes . Depending on the requirement of toll alerting, it may be necessary to prefix a telephone numbers with 1 . The NANPA publishes dial plan information for individual area codes . </P>

Why canada and us have same country code