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Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.
An area code of three digits dialed after the country code determines the area served in the United States and its territories, Canada, and much of the Caribbean. Zone 2 uses two 2-digit codes (20, 27) and eight sets of 3-digit codes (21x–26x, 28x, 29x), mostly to serve Africa , but also Aruba , Faroe Islands , Greenland and British Indian ...
Codes Area 0–99: Metropolitan areas of Mexico: Guadalajara, Monterrey and Mexico City: 200–299: ... (such as 1-900 numbers in the United States) . Nowadays 900 ...
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
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The Guantanamo Bay Naval Base, operated by the United States Navy, has an unofficial area code of 99, which is only dialable from within the United States.Dialing 011 53 99 returns a second dial tone, after which the local number at the naval base can be dialed.
The 0–99 range of area codes in Mexico serve the country's three largest cities. Area code 33 serves the Metropolitan area of Guadalajara, Jalisco, area code 55 and area code 56 serve the Metropolitan area of Mexico City (Mexico State and the CDMX), and area code 81 serves the Metropolitan area of Monterrey, Nuevo León.
Also in Maranhão, the city of Timon, which is next to the Piauí capital city of Teresina, formerly used northern Piauí area code 86, but now it uses the Maranhão area code 99. Area code 61 primarily serves the Federal District (comprising the national capital city, Brasília), but it also serves some surrounding municipalities in the State ...