The phone code 381 at the beginning of the phone number +381 (subscriber’s phone) means that you are being called from Serbia or you are calling a subscriber registered in Serbia.
+381 — Serbia
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Telephone Code +381 — what country it is
The international phone code +381 officially belongs to Serbia, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “381″ after the “+” sign to call to Serbia. Then the next digits of the phone number can be entered.
Whose country code is +381?
+381 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Serbia. 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.