The phone code 30 at the beginning of the phone number +30 (subscriber’s phone) means that you are being called from Greece or you are calling a subscriber registered in Greece.
+30 — Greece
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Telephone Code +30 — what country it is
The international phone code +30 officially belongs to Greece, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “30″ after the “+” sign to call to Greece. Then the next digits of the phone number can be entered.
Whose country code is +30?
+30 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Greece. 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.