Area code 721 is the telephone area code of Sint Maarten within the North American Numbering Plan. Sint Maarten became a NANP territory on September 30, 2011, after having been approved for membership in 2009. Previously, Sint Maarten used the country code +599, originally assigned to the now-dissolved Netherlands Antilles and still in use by Curaçao and the Caribbean Netherlands (Bonaire, Sint Eustatius, and Saba). The northern French side of the island, known as Saint-Martin, is not within the North American Numbering Plan, and has the country code +590, shared with Guadeloupe and Saint Barthélemy. Calls between the two parts of the island are international calls.