The phone code 234 at the beginning of the phone number +234 (subscriber’s phone) means that you are being called from Nigeria or you are calling a subscriber registered in Nigeria.
+234 — Nigeria
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Telephone Code +234 — what country it is
The international phone code +234 officially belongs to Nigeria, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “234″ after the “+” sign to call to Nigeria. Then the next digits of the phone number can be entered.
Whose country code is +234?
+234 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Nigeria. 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.