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oo ( zero zero ) is the International Access (Dial) Code you use to call overseas from 'within' Portugal.
351 ( three five one ) is the International Country Calling Code for Portugal.
(If you are behind a switchboard you may have to dial '0' or '9' (or another number) to get an external line.)
City Area Telephone Codes
City codes not required. All points nine digits.
Note: Effective December 1999, Portugal changed its dialing scheme to incorporate the previous city codes into local phone numbers. In addition to the prior city codes, the following digits were added at the beginning of each number for various types of services.