Amsterdam is in Dutch telephone area code 020, which is +31 20 in international format.
Bruges (or Brugge) is in Belgian area code 050, which is +32 50 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.)
Amsterdam is in Dutch area code 020, which becomes +31 20 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.)
The country code and area code of Ane, Netherlands is 31, (0)524.
The country code and area code of Barneveld, Netherlands is 31, (0)342.
The country code and area code of Doetinchem, Netherlands is 31, (0)314.
The country code and area code of Delft, Netherlands is 31, (0)15.
The country code and area code of Harderwijk, Netherlands is 31, (0)341.
The country code and area code of Grave, Netherlands is 31, (0)486.
The country code and area code of Vianen Zh, Netherlands is 31, (0)347.
The country code and area code of Bennekom, Netherlands is 31, (0)318.
The country code and area code of Maastricht, Netherlands is 31, (0)43.
The country code and area code of Tholen, Netherlands is 31, (0)166.
The country code and area code of Gorinchem, Netherlands is 31, (0)183.
The country code and area code of Aalsmeer, Netherlands is 31, (0)297.