Switzerland is country code +41. Geneva is 022 from within Switzerland, or +41 22 in international format.
(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.)
Post codes for Geneva are in the range 1200 to 1299.
An international body called the International Telecommunications Union in Geneva, Switzerland, assigns the telephone country codes.
Telephone numbers beginning with +41 77 are GSM mobiles in Switzerland.
The country code and area code of Baden, Switzerland is 41, (0)56.
The country code and area code of Aigle, Switzerland is 41, (0)24.
The country code and area code of Thun, Switzerland is 41, (0)33.
The country code and area code of Bern, Switzerland is 41, (0)31.
The country code and area code of Basel, Switzerland is 41, (0)61.
The country code and area code of Biel, Switzerland is 41, (0)32.
The country code and area code of Burgdorf, Switzerland is 41, (0)34.
The country code and area code of Fribourg, Switzerland is 41, (0)26.
The country code and area code of Sion, Switzerland is 41, (0)27.