The Cayman Islands are part of North America's telephone country code +1, which also includes the USA, Canada, and 17 other island countries and territories in or near the Caribbean.
The Cayman Islands use area code +1 345.
To call from other places in North America, just dial 1-345- and the 7-digit number.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The Cayman Islands are part of the North American Numbering Plan, telephone country code +1, along with the USA, Canada, and various islands. The Cayman Islands use area code +1 345.
Calls from the US and other NANP locations to the Caymans are dialed "one plus," the same as domestic long-distance calls, but international rates will apply.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The Aland Islands are part of Finland, which is telephone country code +358.
The area code for the Cayman Islands is 345.
The Marshall Islands use country code +692.
The zip code of the Cayman Islands, is KY1.
The Falkland Islands (also known as the Islas Malvinas) are country code +500.
The postal code for the Cayman Islands consists of an island code, a hyphen separator, and a section code. There are only three island codes: KY1 for Grand Cayman, KY2 for Cayman Brac, and KY3 for Little Cayman. The section codes denote sections according to which local post office handles a particular group of post boxes.
(see related question)
The Solomon Islands use country code +677. There are no city codes or area codes. The local number is 5 or 7 digits.
Telephone country code +1 is North America, including the USA, Canada, and 18 islands in or near the Caribbean, but there is no area code +1 467. There are no valid telephone numbers beginning with +1 467.
345Note that, although you dial a number in the Cayman Islands from the USA or Canada as "one plus" (e.g., 1-345-555-0123), international call charges will apply.The Cayman Islands are in telephone country code +1.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
The area code is 345 for the Cayman Islands. There are, however, personal postal codes that vary per household / PO Box that start with "KY1".
The telephone country code for the US (including territories in the Caribbean and Pacific), plus Canada and a bunch of Caribbean/nearby islands, is +1.