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  1. Telephone numbers in Portugal. Portugal changed to a closed telephone numbering plan on 31 October 1999; previously, the trunk prefix was '0', but this was dropped. [1] For landline subscribers, the area code, prefixed by the digit '2', was incorporated into the subscriber's number.

  2. Números de telefone em Portugal. Em Portugal, os números de telefone são regulados pela Anacom, no Plano Nacional de Numeração. [ 1] O indicativo do país é 351 [ 2], isto é, quem liga a partir do estrangeiro terá de acrescentar +351 ao início do número.

  3. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

  4. Telephone numbers in Portugal. For landline subscribers, the area code, prefixed by the digit '2', was incorporated into the subscriber's number. For mobile subscribers, formerly seven (to call another subscriber using the same operator) or eleven (to call any mobile subscriber) digits were used.

  5. O primeiro serviço de telefone automático foi inaugurado em Portugal em 1930 e em 25 de Setembro de 1937 a APT inaugurou a primeira estação automática na Estrela em Lisboa. Nesse ano a rede da APT tinha 48 000 assinantes.

  6. Calling codes in Europe. Telephone numbers in Europe are managed by the national telecommunications authorities of each country. Most country codes start with 3 and 4, but some countries that by the Copenhagen criteria are considered part of Europe have country codes starting on numbers most common outside of Europe (e.g. Faroe Islands of ...

  7. Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing. Telephone numbering plans are defined in each of the administrative regions of the public switched telephone network (PSTN) and in private telephone networks.