Calling Finland from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 358 - Country Code for Finland
• Phone Number (may not begin with 0):
  • fixed - 5 to 12 digits including area code
  • cell phones - mostly 9 digits
  • national subscriber numbers - 5 to 10 digits:
    • used by businesses and institutions, usually charging extra to call
    • leading digits can be: 10, 20, 29, 30, 39, 60, 7X
• sample call from US to a landline in Helsinki: 011 358 9 ???? ????

How to dial to Finland cellular:

• dialing format for calls to a cell phone: 011 358 4? ??? ???? (or 50 ??? ????)
• some cell phone numbers comprise 8 or 10 digits instead of the usual 9 digits

Area Codes:

Phone Books:

• Fonecta - Finnish people and commercial listings, requires registration, not in English
• Aland.com - phone book and island guide