The phone code 377 at the beginning of the phone number +377 (subscriber’s phone) means that you are being called from Monaco or you are calling a subscriber registered in Monaco.
+377 — Monaco
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Telephone Code +377 — what country it is
The international phone code +377 officially belongs to Monaco, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “377″ after the “+” sign to call to Monaco. Then the next digits of the phone number can be entered.
Whose country code is +377?
+377 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Monaco. 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.