The phone code 673 at the beginning of the phone number +673 (subscriber’s phone) means that you are being called from Brunei Darusalaam or you are calling a subscriber registered in Brunei Darusalaam.
+673 — Brunei Darusalaam
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Telephone Code +673 — what country it is
The international phone code +673 officially belongs to Brunei Darusalaam, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “673″ after the “+” sign to call to Brunei Darusalaam. Then the next digits of the phone number can be entered.
Whose country code is +673?
+673 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Brunei Darusalaam. 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.