Telephone numbers in Cuba

Telephone numbers in Cuba conform to a fixed format of eight digits. The first one to two are the area code, the remaining digits are the subscriber number.
Calls between locations with different area codes are prefixed with the trunk prefix 0, followed by the area code and telephone number.
The telephone country code is 53.
The international call prefix is harmonized to 00.
The mobile numbers format is 5xxx xxxx.

List of area codes in Cuba

The Guantanamo Bay Naval Base, operated by the United States Navy, has an unofficial area code of 99, which is only dialable from within the United States. Dialing 011 53 99 returns a second dial tone, after which the local number at the naval base can be dialed.