Switzerland is country code +41. Switzerland no longer uses area codes, per se; you must dial the full national number on all calls. Numbers in Wettingen mostly begin with 056, or +41 56 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.)
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 Lausanne, Switzerland is 41, (0)21.
The country code and area code of Rapperswil, Switzerland is 41, (0)55.
The country code and area code of Bellinzona, Switzerland is 41, (0)91.
The country code and area code of Olten, Switzerland is 41, (0)62.
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.
The country code and area code of Winterthur, Switzerland is 41, (0)52.
The country code and area code of Basel, Switzerland is 41, (0)61.