British Indian Ocean Territory (+246) dialing prefix simplified.
The BIOT hosts Diego Garcia, the Indian Ocean's key US-UK military base. Ringflow provides +246 routing for authorized defense and government contacts.
Everything about calling BIOT.
The British Indian Ocean Territory uses a five-digit numbering plan under +246. Diego Garcia hosts a major US-UK military base; access for non-government calls is extremely restricted.
British Indian Ocean Territory country information
Three ways to call British Indian Ocean Territory right now.
Dial +246 then the five-digit number. Civilian access is limited to authorized government and defense contractors. Ringflow routes via approved military and government channels.
Direct calls using landlines & mobile phones
Dial British Indian Ocean Territory directly from any landline or mobile by entering your international exit code, then the country code +246, and finally the local number.
International calling cards for British Indian Ocean Territory
Pre-paid international calling cards remain a convenient, low-cost way to reach British Indian Ocean Territory. Each card gives you a PIN and an access number to place global calls.
VoIP services for contacting British Indian Ocean Territory
VoIP apps like Skype, WhatsApp and Viber — and business VoIP from Ringflow — route calls to British Indian Ocean Territory over the internet, usually at far lower rates than traditional carriers.
BIOT at a glance.
A British Overseas Territory in the central Indian Ocean, comprising the Chagos Archipelago. Diego Garcia hosts one of the world's most strategically important joint US-UK military installations.
How to call the British Indian Ocean Territory.
Dial +246 then the five-digit number. Access is restricted — only defense contractors and authorized government personnel typically have routing to BIOT numbers.
Number anatomy
Start with the exit prefix
Press + on a mobile (hold the 0 key), or dial 00 from most countries / 011 from North America.
Add the British Indian Ocean Territory code
Dial +246. This identifies British Indian Ocean Territory on the global telephone network.
Enter the area or mobile prefix
Type the first part of the local number. Drop the leading 0 if there is one.
Finish with the subscriber number
The remaining digits route the call to the specific line in Diego Garcia or elsewhere.
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Search by country name, ISO code or dial prefix. Click any country for its dialing rules and Ringflow's local number availability.
FAQ
Calling BIOT, answered.
What defense and government contractors ask before dialling BIOT on +246.
Connect to BIOT on authorized defense and government routes.
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