The phone code 255 at the beginning of the phone number +255 (subscriber’s phone) means that you are being called from Tanzania or you are calling a subscriber registered in Tanzania.
+255 — Tanzania
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Telephone Code +255 — what country it is
The international phone code +255 officially belongs to Tanzania, so all phone numbers that start with these numbers refer to this country.
It means that you must enter “255″ after the “+” sign to call to Tanzania. Then the next digits of the phone number can be entered.
Whose country code is +255?
+255 is the beginning of a phone number which can belong to any subscriber who purchased a SIM card in Tanzania. 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.