Telephone country codes never begin with zero.
Country code +857, which would be dialed as 00 857 from many places, is an unused code.
Country code +57, dialed as 008 57 from many places, is Colombia (South America).
To avoid confusion, it is best to write an international telephone number in correct international format, beginning with the plus symbol and the correct telephone country code (e.g., +850 or +57), omitting any dialing prefix.
(The plus signmeans "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Country code +57 (dialed as 00 57 from many places) is Colombia.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
There is no country code +67 or 0067, but several three-digit country codes begin with +67. You need another digit. Country codes +670 through +679 are for various island nations in the Pacific. See the related questions below.
Note that +671 was formerly used for Guam, which now uses +1 671.
Note also that +670 was formerly used for the Commonwealth of the Northern Mariana Islands (Saipan, Tinian, and Rota), which now use +1 670. Country code +670 was reassigned to Timor-Leste (East Timor).
Country code +672 used to include the Cocos Islands (now +61 8 9162 XXXX) and Christmas Island (now +61 8 9164 XXXX), but you now must use the +61 codes. Only Norfolk Island and Australian bases in Antarctica continue to use +672.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Suriname is country code +597(dialed as 00 597 from many places).
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Country codes beginning with +59 (or 00 59) are in South America and the Caribbean, but you need the third digit to be specific.
+590 = Guadeloupe, St. Barthelemy, and [French] St.-Martin* +591 = Bolivia +592 = Guyana +593 = Ecuador +594 = [French] Guiana +595 = Paraguay +596 = Martinique +597 = Suriname +598 = Uruguay +599 = Curacao, Bonaire, Sint Eustatius, and Saba
* The island of St. Martin is divided between France and the Netherlands. The French northern half uses country code +590. The Dutch southern half, Sint Maarten, formerly used country code +599, but now uses +1 721.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Country code +56 (dialed as 00 56 from many places) belongs to Chile.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Country code +58 (dialed as 00 58 or 011 58 from many places) is Venezuela.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
There is no telephone country code +77, as such, but +7 (dialed as 00 7 from many places) is Russia and Kazakhstan, and all numbers beginning with +7 7 are allocated to Kazakhstan. However, it is incorrect to refer to "country code +77"; the correct country code is just +7.
All numbers in Kazakhstan begin with +7 7.
Landlines in Kazakhstan begin with +7 71 or +7 72.
Mobiles in Kazakhstan begin with +7 70 or +7 77.
Other services in Kazakhstan begin with +7 75 or +7 76.
Numbers beginning with +7 73, +7 74, +7 78, and +7 79 are invalid codes.
(Originally, country code +7 was the entire USSR, but all the other former Soviet republics split off into their own individual country codes.)
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Telephone country codes never begin with zero.
Country code +57, dialed as 00 57 from many places, is Colombia in South America.
Country code +7, dialed as 005 7 from many places, is Russia and Kazakhstan.
To avoid confusion, it is best to write an international telephone number in correct international format, beginning with the plus symbol and the correct telephone country code (e.g., +57 or +7), omitting any dialing prefix.
(The plus signmeans "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Which contrite code
The telephone country code for Zimbabwe is +263. The area code for Glendale is 0376, or +263 376 in international format.
The telephone country code for Vietnam is +84. The area code for Bac Giang is 0240, or +84 240 in international format.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
There is no 909 country code.
There is no telephone country code +897, nor +89, nor any other country code beginning with +89. There are no valid telephone numbers beginning with +89.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Togo is country code +228.
Liberia is country code +231.