The phone code 378 at the beginning of the phone number +378 (subscriber’s phone) means that you are being called from San Marino or you are calling a subscriber registered in San Marino.
+378 — San Marino
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Telephone Code +378 — what country it is
The international phone code +378 officially belongs to San Marino, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “378″ after the “+” sign to call to San Marino. Then the next digits of the phone number can be entered.
Whose country code is +378?
+378 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in San Marino. 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.