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Every country has both a country calling code used to dial into a country, and an international call prefix or international access code used to dial out of the country. The ITU approved 00 as the general standard some time ago, and this has been implemented by a large number of countries, but not all. This page lists the exceptions.

International phone numbers are usually written with a + before the phone number representing the international call prefix. Some phones allow this to be entered directly, often by holding the '0' key (most GSM mobile phones) or with two consecutive presses of the * key, which avoids having to know the international call prefix. For example a UK phone number written as +44 1234 567890 would be dialled as 567890 from the '01234' linked numbering scheme exchanges in the UK; as 01234 567890 from elsewhere in the UK; and as 00 44 1234 567890 from countries using the 00 international access code. For countries using a prefix other than 00, simply substitute that for 00 in the last example; for example, from North American Numbering Plan countries (including the United States and Canada), dial 011 44 1234 567890.

Many states also provide alternative dialing arrangements for calls to neighbouring countries.

Note: ‘~’ means to await a tone before continuing.

• 00
  • All countries not listed below.

• 0~0
  • Poland (also supports the ITU standard)

• 0x0
  • Mauritius ('x' represents one digit defining an 'International Long Distance' operating company.)
    • 00 Only works from payphones and '+' only from mobile phones.^[1]

• 00~
  • Algeria
  • Morocco

• 00xx ('xx' represents two-digit Brazilian Carrier Selection Code)
  • Brazil

• 000
  • Kenya^[1]
  • Tanzania (including Zanzibar)^[1]
  • Uganda^[1]

• 001
  • Hong Kong (also 002 (fax), 0060, 007, 008, 0080, 009 and many others for service from different telecom carrier)
  • Indonesia (also 008)
  • Mongolia
  • Singapore (also 002, 008, 012, 013, 018, 019)
  • South Korea (also 002, 005, 006, 008, more than tens of 003xx or 007xx based IDD services that are mostly used on mobile phones as well as landlines.)
  • Thailand

• 0010
  • Bolivia (also 0011, 0012, 0013)

• 0011
  • Australia (also 0014, 0015, 0018)

• 002
  • Taiwan (also 005, 006, 007, 009, 019)
  • Paraguay

• 005
  • Colombia (also 007, 009)

• 009
  • Nigeria

• 010
  • Japan

Note that many Japanese phone subscriptions don't include international calls. If the one in use doesn't, you have to dial a prefix of three or four digits before the 010 prefix, to select an international phone carrier. Even if your phone subscription includes international calls, you may use one of those prefixes to select a phone carrier other than the usual one. Selecting a phone carrier is mandatory if you use a public payphones. Different codes available: 001 010 (KDDI) 0033 010 (NTT) 0041 010 (Japan Telecom) 0061 010 (Japan Telecom IDC) NB: Japan Telecom and Japan Telecom IDC are different!

• 011
  • North American Numbering Plan area:
    • United States of America including Puerto Rico, U.S. Virgin Islands, Guam, Northern Mariana Islands and American Samoa
    • Canada
    • Anguilla
    • Antigua and Barbuda
    • Bahamas
    • Barbados
    • Barbuda
    • Bermuda
    • British Virgin Islands
    • Cayman Islands
    • Dominica
    • Dominican Republic
    • Grenada
    • Jamaica
    • Montserrat
    • Saint Kitts and Nevis
    • Saint Lucia
    • Saint Vincent and the Grenadines
    • Trinidad and Tobago
    • Turks and Caicos Islands

• 01x
  • Israel ('x' represents one digit defining a carrier. Also supports the ITU standard.)

• 05
  • Papua New Guinea

• 07~
  • (Old) Spain (Now 00)

• 1xx0 ('xx' represents two-digit Chilean Carrier Selection Code; For example, an argentinean phone number written as +54 11 23456789 would be dialed as 1230 54 1123456789 or 1880 54 1123456789)^[2]
  • Chile

• 119
  • Cuba

• 15
  • Chad

• 19
  • Central African Republic

• 19~
  • Wallis and Futuna Islands

• 8~10
  • Was a standard for the Soviet Union and so remains one for several post-Soviet countries:
    • Belarus
    • Georgia
    • Kazakhstan
    • Russia^[3]
    • Tajikistan
    • Turkmenistan
    • Ukraine
    • Uzbekistan
• 90
  • Burundi

• 99
  • Serbia

• 99…
  • Finland, where to encourage competition between international telephone carriers, a system of prefixes beginning with 99 was introduced in addition to the 00 prefix. For example, if the subscriber dials 990-1-234-567-7890, the call will be routed to North America via TeliaSonera.
    • 990 TeliaSonera
    • 991 Jippii
    • 994 Song
    • 99500 Cubio
    • 99588 Globetel
    • 996 Finnet
    • 999 Elisa Oyj

1. ^ ^{a b c d} [1]
2. ^ Although in Chile all the carriers use the 1 prefix, the number of the carrier in advertising and common usage includes the 1 prefix as a part of the number.
3. ^ The domestic call prefix 8 and international call prefix 8~10 are to be replaced by the ITU-recommended dialling prefixes of 0 and 00. The first step will be to replace area codes beginning with the digit '0' with ones beginning with '4', hence Moscow 095 becomes 495. See also Telephone numbering plan for Russia and Kazakhstan.

• List of country calling codes