LIME (the former Cable & Wireless) and Digicel Ltd. are the main providers. The area code for the Cayman Islands is 345. To make local calls (on or between any of the three islands), dial the seven-digit number. Credit cards and calling cards can be used to call worldwide from any phone and most hotels, though from the latter there's almost always a hefty surcharge, even to access toll-free access numbers for prepaid phone cards.
If you're bringing your own mobile phone and it's compatible with 850/1900 Mhz GSM network or TDMA digital network, you should be able to make and receive calls during your stay, especially from Grand Cayman. Be sure, however, to check with your home provider to be sure that you have roaming service enabled, and note that charges can be astronomical depending on your calling plan. Mobile phone rental is available from LIME and Digicel; you can stay connected for as little as CI$5 per day plus the cost of a calling card (denominations range from CI$10 to CI$100). International per-minute rates usually range from CI 35¢ to CI 60¢.
LIME (Anderson Square Bldg., Shedden Rd., George Town, Grand Cayman. 345/949-7800. www.time4lime.com) Digicel (Cayman Financial Center, 3rd fl., 36A dr Roys Dr., George Town, Grand Cayman. 345/623-3444. www.digicelcayman.com)