All private telephone numbers in Norway have 8 digits. Some support telephones has 4 or 5 digits. Emergency telephones like police, has three digits. All mobile telephone numbers have 8 digits.
The first two digits in private telephone numbers usually indicates where the telephone is located in Norway. I.e. 22 indicates Oslo and 55 indicates Bergen. When you make local calls to private telephone numbers in Norway, you have to dial 8 digits. At this site we have only given the 8 digits.
The country code for Norway is 47. If you are calling from abroad Norway, then you have to dial the code for international calls (typical 0 or 00), then 47 and the 8 digit phone number in Norway. I.e. 00 47 55 55 20 00.