When signing up for a Portuguese SIM card, you’ll usually be required to provide: Your name. Valid ID. Notably, prepaid SIM cards in Portugal often come preloaded with credit (e.g., €5, €10, €15, etc.), giving you the flexibility to select the appropriate amount of credit based on your immediate usage needs. Besides Vodafone Portugal has assigned country code + 351. This number + 351 is equal with international calling code and it’s simply the telephone dialing prefixes used for calling Vodafone numbers. Vodafone uses 2 GSM bands, 2 UMTS bands, 4 and 0 CDMA bands.. You can read the specific frequency bands in the table below. For further information please visit www.vodafone.com Company: Vodafone Portugal – Comunicações Pessoais, S.A. Registered Office: Avenida D. João II, Lote 1.04.01, Parque das Nações, 1998 – 017 Lisbon p75pz2.