The phone code 683 at the beginning of the phone number +683 (subscriber’s phone) means that you are being called from Niue or you are calling a subscriber registered in Niue.
+683 — Niue
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Telephone Code +683 — what country it is
The international phone code +683 officially belongs to Niue, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “683″ after the “+” sign to call to Niue. Then the next digits of the phone number can be entered.
Whose country code is +683?
+683 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Niue. 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.