Calling Saint Barthelemy from the United States explained:

• 011 - US exit code; dial first for international calls made from the USA or Canada
• 590 - Country Code for Saint Barthelemy
• Phone Number (may not begin with 0) - 9 digits
• US to St. Barths international dialing format: 011 590 ??? ?? ?? ??

How to dial to St. Barthelemy cellular:

• dialing format for calls to a cell phone: 011 590 690 ?? ?? ??

Phone Books:

• Pages Jaunes and Pages Blanches - French Yellow and White Pages; enter "Saint Barthelemy" in the region (Ou) field
• St. Barths Online - a helpful island guide