The phone code 257 at the beginning of the phone number +257 (subscriber’s phone) means that you are being called from Burundi or you are calling a subscriber registered in Burundi.
+257 — Burundi
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Telephone Code +257 — what country it is
The international phone code +257 officially belongs to Burundi, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “257″ after the “+” sign to call to Burundi. Then the next digits of the phone number can be entered.
Whose country code is +257?
+257 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Burundi. 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.