The phone code 243 at the beginning of the phone number +243 (subscriber’s phone) means that you are being called from Zaire or you are calling a subscriber registered in Zaire.
+243 — Zaire
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Telephone Code +243 — what country it is
The international phone code +243 officially belongs to Zaire, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “243″ after the “+” sign to call to Zaire. Then the next digits of the phone number can be entered.
Whose country code is +243?
+243 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Zaire. 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.