Calling Diego Garcia from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 246 - Country Code for Diego Garcia
• Phone Number - 7 digits
• US to Diego Garcia international dialing format: 011 246 ??? ????

How to dial to Diego Garcia cellular:

• dialing format for calls to a cell phone: 011 246 38? ????

Landline numbers format:

• 37? ????