The phone code 237 at the beginning of the phone number +237 (subscriber’s phone) means that you are being called from Cameroon or you are calling a subscriber registered in Cameroon.
+237 — Cameroon
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Telephone Code +237 — what country it is
The international phone code +237 officially belongs to Cameroon, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “237″ after the “+” sign to call to Cameroon. Then the next digits of the phone number can be entered.
Whose country code is +237?
+237 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Cameroon. 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.