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There are 680 usable area codes in the United States, of which 215 are currently in use. Each area code has 7,920,000 telephone numbers (out of a possible 10,000,000) available within it.

An international call prefix or dial out code is a trunk prefix used to select an international telephone circuit for placing an international call. It is now called an IDD prefix (international direct dialing) – a country will typically have an NDD prefix as well (national direct dialing).^[1] The international dialing prefix must be dialed before the country calling code and the destination telephone number. Bitpay for business. It is synonymous with international access code or exit code. The international call prefix is part of the telephone numbering plan of a country for calls to another country.

The International Telecommunication Union (ITU) recommends the sequence 00 as a standard for an international call prefix, and this has been implemented by most countries, but not all of them.^[2] Some countries use the 00 prefix which is followed by the international carrier code. Does cigna have a copay.

When phone numbers are published for use abroad, they typically show a plus sign (+) prefix in place of any international call prefix, to signify that the caller should use the prefix code appropriate for their country.^[3] Many phones allow the plus sign to be entered in their saved number lists, often by holding down the zero (0) key (most GSM mobile phones) or with two consecutive presses of the star (*) key. When making a call, the system then automatically converts the plus sign to the correct international prefix, depending on where the phone is being used, which enables callers to use the same stored number when calling from either their own country or any other.^[4]

Example[edit]

Calling the Dunedin City Council in New Zealand:

Call placed from	Number dialed	IDD Prefix
China, Italy, the United Kingdom or any other country following the ITU-recommendation	00 64 3 477 4000	00
Canada, United States or any other NANP country direct-dial using the default long distance carrier	011 64 3 477 4000	011
Canada, United States or any other NANP country direct-dial using an alternative long distance carrier (where xxxx is the carrier number)	101 xxxx 011 64 3 477 4000	011
Canada, United States or any other NANP country operator assisted using the default long distance carrier	01 64 3 477 4000	01
Japan	010 64 3 477 4000	010
Australia	0011 64 3 477 4000	0011
Russia (using predefined international call operator)	810 64 3 477 4000	810
Phones that allow the plus symbol (+), e.g. mobile phone	+ 64 3 477 4000	auto-generated depending on location of phone
New Zealand	03 477 4000	N/A (domestic call)

Variations[edit]

Some telecommunications service providers or mobile network operators (wireless carriers) have different international call prefix codes which callers or subscribers can use to route calls through specific networks, sometimes with special pricing arrangements.

Many countries also provide alternative dialling arrangements for calls to neighbouring countries.^[5]

Some of these variations from the generic codes are shown in the list below (but may be out of date).

Countries by international prefix[edit]

0
- Samoa
00 (the recommended ITU prefix)
- Africa: all countries except Kenya, Nigeria, Tanzania and Uganda
- Asia: most countries, with exceptions in Central Asia, South-East Asia and East Asia
- Europe: all countries except Belarus and Russia
- Middle East: all countries
- North America: all countries except Cuba and those using 011
- South America: most countries
000
- Kenya^{[notes 1]}
- Tanzania^{[notes 1]}
- Uganda^{[notes 1]}
001
- Guyana
- Mongolia
001x, where x is the international carrier selection code consisting of one or more digits
- Australia:
  - 0011 – default carrier
  - 0015 – default carrier – circuit switched connection (usually, for fax transmission)
  - 0014 – Primus
  - 0018 – Telstra
  - 0019 – Optus – circuit switched connection (usually, for fax transmission)
009
- Nigeria
00x, where x is the international carrier selection code consisting of one or more digits
- Brazil:
  - 0015 – Vivo
  - 0021 – Embratel
  - 0031 – Oi
  - 0041 – TIM
- Cambodia: 001, 007
- Colombia: 005, 007, 009
- Hong Kong:
  - 001 – default carrier
  - 002 – default carrier – circuit switched connection (usually, for fax transmission)
  - 0030 – Hong Kong Broadband Network
  - 0050 – ComNet Telecom (HK) Limited
  - 0059 – HKC Network Ltd
  - 0060 – PCCW
  - 0070 – Wharf T&T
  - 0080 – Hutchison Telecom
  - 0090 – New World Telecommunications
  - A number of international call providers use 15XX and 16xx prefixes (External Telecommunication Service)
- Indonesia: 001, 007, 008, 009
- Kazakhstan: 008, 009, 010, 810
- Singapore:
  - 000 – default carrier
  - 001 – SingTel
  - 002 – M1
  - 008 – StarHub
- South Korea:
  - 001 - KT
  - 002 - LG Telecom
  - 003xx - Various VoIP based carriers
  - 005 - SK Broadband
  - 006 - SK Telink
  - 007xx - Various VoIP based carriers
  - 008 - Sejong(Onse) Telecom
- Taiwan:
  - 002/012/009/019 - Chunghua Telecom
  - 005/015 - Asia Pacific Telecom
  - 006/016 - Taiwan Mobile Telecom
  - 007/017 - Far East Tone
  - 18866002 - Tstar Telecom
- Thailand:
  - 001 – CAT Telecom standard
  - 002 – Triple T GlobalNet
  - 003 – Advanced Wireless Network
  - 004 – Total Access Communication
  - 005 (standard), 00500 (low cost) – AIN GlobalComm
  - 006 (standard), 00600 (low cost) – True Move
  - 007 – TOT standard
  - 008 – TOT low cost (via VoIP)
  - 009 – CAT Telecom low cost (via VoIP)
010
- Japan
- Kazakhstan also 008, 009, 810
011 – all countries in the North American Numbering Plan:
- American Samoa
- Anguilla
- Antigua and Barbuda
- Bahamas
- Barbados
- Bermuda
- British Virgin Islands
- Canada
- Cayman Islands
- Dominica
- Dominican Republic
- Grenada
- Guam
- Jamaica
- Micronesia
- Montserrat
- Northern Mariana Islands
- Palau
- Puerto Rico
- Saint Kitts and Nevis
- Saint Lucia
- Saint Vincent and the Grenadines
- Sint Maarten
- Trinidad and Tobago
- Turks and Caicos Islands
- United States of America
- United States Virgin Islands
119
- Cuba
1xx0, where xx is the international carrier selection code
- Chile
8~10^{[notes 2]}
- Belarus
- Kazakhstan also 008, 009, 010
- Tajikistan
- Turkmenistan
- Uzbekistan
8~xx, where xx is the international carrier selection code
- Russia
  - 8~10 – default carrier; Rostelecom (for carrier preselection service subscribers)
  - 8~26 – Arctel
  - 8~27 – Synterra
  - 8~28 – Comstar
  - 8~56 – GoldenTelecom
  - 8~57 – Transtelecom
  - 8~58 – MTT
  - 8~59 – Orange Business Services

Countries using optional carrier selection code[edit]

The following is a non-exhaustive list of countries that allow for optional carrier selection in addition to using the standard prefix.

01x, where x is the international carrier selection code consisting of one or more digits:
- Israel, in addition to the standard prefix 00 for default carrier (see Telephone numbering in Israel)
  - 012 – 012 Smile
  - 013 – 013 NetVision
  - 014 – Bezeq International
  - 015 – Hallo 015
  - 016 – Golan Telecom
  - 017 – Hot Mobile
  - 018 – Xfone
  - 019 – Telzar
10x, where x is the international carrier selection code consisting of two digits:
- Georgia, in addition to the standard prefix 00 for default carrier
  - 1000 – default carrier
  - 1007 – Caucasus Online
  - 1010 – MagtiCom
  - 1011 – SystemNet
  - 1012 – SystemNet
  - 1013 – MacroCom
  - 1015 – SakTelComPlus
  - 1016 – Silknet
  - 1017 – SystemNet
  - 1018 – Global Erty
  - 1019 – Akhtel
  - 1027 – CallCenter
  - 1040 – IntelPhone
  - 1041 – V-TEL Georgia
  - 1050 – MagtiCom
  - 1051 – Caucasus Online
  - 1052 – Alex Development Georgia
  - 1053 – Sky Service
  - 1054 – Lagi
  - 1057 – NewCom
  - 1060 – GeoNet
  - 1061 – Silknet
  - 1062 – Geocell
  - 1063 – Black Sea Telecom
  - 1064 – Central Communication Company of Georgia
  - 1065 – New Net
  - 1067 – GeoTel
  - 1069 – Service
  - 1072 – TelMax
  - 1075 – Wi-MAX Georgia
  - 1076 – Silknet
  - 1094 – Warid Telecom Georgia
99x, where x is the international carrier selection code consisting of one or more digits:
- Finland, in addition to the standard prefix 00 for default carrier (see Telephone numbering in Finland)
  - 990 – Telia Finland Oyj
  - 991 – Elisa Oyj
  - 99511 – Nettia Oy
  - 99533 – DNA Oy
  - 99555 – DNA Oy
  - 99559 – Elisa Oyj
  - 99577 – DNA Oy
  - 99588 – Globetel
  - 99599 - Nettia Oy
  - 999 – Elisa Oyj