The phone code 351 at the beginning of the phone number +351 (subscriber’s phone) means that you are being called from Portugal or you are calling a subscriber registered in Portugal.
+351 — Portugal
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Telephone Code +351 — what country it is
The international phone code +351 officially belongs to Portugal, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “351″ after the “+” sign to call to Portugal. Then the next digits of the phone number can be entered.
Whose country code is +351?
+351 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Portugal. It does not mean that a subscriber is definitely there at the time of the call (since he or she can make a call in roaming), but there is such a possibility.