How to call the Cayman Islands from the USA/Canada:

dial 1 + 345 + local phone number

Calling from another country?

The time in the Cayman Islands is now 07:21:31am

Calling the Cayman Islands from the United States explained:

1 - Country Code for the Cayman Islands
345 - area code within the NANP
local phone number - 7 digits
US to the Cayman Islands international dialing format: 1 345 ??? ????
this country is part of the North American Numbering Plan - NANP (calling it works like a US state to state call)

Phone Books:

Official Cayman Islands White and Yellow Pages