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Canada: North 1 011 1 Several NANP codes; see Telephone numbers in Canada. Caribbean Netherlands: Caribbean 599-3, 4, or 7: 00 Cayman Islands: Caribbean 1-345: 011 1 Chile: South 56: 00 Colombia: South 57: 00 0 Trunk followed by 1 or 3 digit carrier code Costa Rica: Central 506: 00 Cuba: Caribbean 53: 00 Curaçao: Caribbean 599-9: 00 Dominica ...
AT&T divided the United States and Canada into numbering plan areas (NPAs), and assigned to each NPA a unique three-digit prefix, the numbering plan area code, which became known in short-form as NPA code or simply area code. The area code is prefixed to each telephone number issued in its service area.