telephone code for amsterdam
Country code: 31.  Amsterdam area code: 020. Calling a phone number in Holland :  From outside the country: 00 31 20 555 1111 (always drop the leading 0 from the area code).Country code: 31.  Amsterdam area code: 020. Calling a phone number in Holland :  From outside the country: 00 31 20 555 1111 (always drop the leading 0 from the area code).