The country code for calling Switzerland is +41. You must omit the trunk prefix 0 from the beginning of the Swiss number when dialing internationally.
(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.).
Each country in West Africa has its own separate telephone country code, except for Western Sahara, which is effectively controlled by Morocco. The country codes are all three digits, beginning with +2. For more information, ask about a specific country.
India has hundreds of STD Codes (telephone area codes). Please be more specific.
The telephone country code for Argentina is +54. The area code for Chascomus is 02241, or +54 2241 in international format.
The telephone country code for Argentina is +54. The area code for Bahia Blanca is 0291, or +54 291 in international format.
The telephone country code for Argentina is +54. The area code for Formosa is 03717, or +54 3717 in international format.
France does not have telephone area codes. However, numbers starting with a 1 (or 01 domestically) are normally in Paris.
The telephone country code for France is +33. The area code for the southeastern quadrant of the country, including the island of Corsica, is 04, or +33 4 in international format.
Kiribati is country code +686. There are no city codes or area codes. The local number is 5 digits.
The telephone country code for France is +33. The area code for the northeastern quadrant of the country is 03, or +33 3 in international format. The local number is a further 8 digits.
The telephone country code for France is +33. The area code for the southwestern part of the country is 05, or +33 5 in international format. The local number is a further 8 digits.
The Kingdom of Tonga is country code +676. There are no city codes or area codes. The local number is 6 digits.
The Seychelles use country code +248. There are no city codes or area codes. The local number is 7 digits.
Country code +1, area codes 214, 972, and 469, with several more area codes for outer suburbs and other nearby areas.
There are several countries that have domestic area codes 025 or similar. For example, within Hungary, 025 is the area code for Dunaújváros. There is no telephone country code 025, in part because telephone country codes cannot begin with zero. Country codes beginning with +25 are in Africa, but you need one more digit. See the related question.
The telephone country code for Norway is +47. Norway does not have area codes, but telephone numbers in Svalbard and Jan Mayen begin with +47 79.
The telephone country code for France is +33. The area code for Corsica is 04, or +33 4 in international format. The local number is a further 8 digits.
The telephone country code for France is +33. The area code for Bourgogne is 03, or +33 3 in international format. The local number is a further 8 digits.