To Dial British Indian Ocean Territory, you should start with dialing the IO international code +246 then the appropriate area code and the local number.

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How to dial British Indian Ocean Territory
Example phone dialings for British Indian Ocean Territory
NationalInternational
Fixed Line370 9100+246 370 9100
Mobile380 1234+246 380 1234
Fixed Line Or Mobile370 9100+246 370 9100