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International telephone country codes are grouped by geographic zones.

Zone 1, which contains only country code +1, is North America, including the USA, Canada, and certain islands in or near the Caribbean.

Zone 2 is Africa.

Zone 3/4 is Europe.

Zone 5 is the Americas, except the part in Zone 1.

Zone 6 is Australia/Pacific.

Zone 7 was originally the USSR, but is now just Russia and Kazakhstan, which continue to share country code +7.

Zone 8 is East Asia.

Zone 9 is the rest of Asia.

Only two zones have one-digit country codes, +1 for North America and +7 for Russia and Kazakhstan. Other countries have two- or three-digit codes. There are also country codes assigned for certain international purposes.

An international body, the International Telecommunications Union (ITU) in Geneva, Switzerland, is responsible for assigning telephone country codes.

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