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Cuba ☎️ Landline / Geographic

Area Code 21 – Guantánamo Province

The phone area code for Guantánamo Province is 21 (international format +5321). Browse local exchange codes (NXX) and carrier assignments below.

Current Local Time
05:36:26
UTC • UTC +00:00
Full Dialing Format
+5321
Population 272,801
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Admin Region Guantánamo Province
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Elevation 56m
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GPS Coordinates 20.1444, -75.2092
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📍 Geographic Location of Guantánamo Province

Overview of Area Code 21 in Cuba

Area code 21 is a geographic National Destination Code (NDC) assigned to the province of Guantánamo, located in the easternmost part of Cuba. This code is part of the Cuban national numbering plan, which follows the ITU-T E.164 recommendation. The country calling code for Cuba is +53, and when dialing a fixed-line number in Guantánamo from abroad, the international format is +53 21 XXX XXXX (or +53 21 XXX XXX depending on the local number length).

Coverage and Administrative Jurisdiction

The 21 area code serves the entire Guantánamo Province, including its capital, the city of Guantánamo, as well as other municipalities such as Baracoa, Maisí, and Imías. The province is known for its historical significance and the Guantánamo Bay Naval Base, which is a separate U.S.-leased territory and does not use the Cuban numbering plan.

Dialing Formats and Instructions

For local calls within Guantánamo (same area code), subscribers typically dial the 7-digit local number directly (e.g., 21 XXX XXXX). For calls from other provinces in Cuba, callers must dial 0 followed by the area code and the local number: 0 21 XXX XXXX. International callers should dial +53 21 XXX XXXX (or the international exit code of their country, then 53, then 21, then the local number).

It is important to note that Cuba has implemented overlay and area code changes in the past, but as of the latest updates, area code 21 remains the sole geographic code for Guantánamo. No overlay codes have been introduced for this province.

Numbering and Technical Considerations

Cuban fixed-line numbers are generally 8 digits long when including the area code (e.g., 21 XXX XXXX). The national significant number (NSN) length is 8 digits, which includes the area code. The prefix '21' is a geographic NDC, meaning it is tied to a physical location and is used for PSTN (Public Switched Telephone Network) services. Calls to these numbers are routed via traditional circuit-switched networks, though some may be carried over IP-based infrastructure for long-distance segments.

For businesses and individuals, it is essential to verify the correct local number length, as some older numbers may have fewer digits. Always confirm with the recipient or a reliable directory before dialing.

❓ Frequently Asked Questions

What is the international dialing format for a fixed-line number in Guantánamo, Cuba?
To call a fixed-line number in Guantánamo from outside Cuba, dial your country's international exit code, then Cuba's country code 53, then area code 21, followed by the local 7-digit number. For example: +53 21 XXX XXXX.
Is area code 21 used for mobile phones in Cuba?
No, area code 21 is exclusively for geographic fixed-line numbers in Guantánamo Province. Cuban mobile numbers use non-geographic prefixes starting with 5, such as 52, 53, 54, etc.
How do I call a Guantánamo number from another province in Cuba?
From other provinces, you need to dial the trunk prefix 0, then the area code 21, and then the local number. For example: 0 21 XXX XXXX.
Are there any overlay codes for Guantánamo?
As of now, there is no overlay code for Guantánamo. Area code 21 remains the sole geographic code for the province. However, numbering plan changes can occur, so always check current regulations.
Why do some Guantánamo numbers have fewer digits?
Historically, some local numbers in Cuba had fewer digits. While most numbers now have 7 digits after the area code, older numbers may still be in use. Always confirm the correct number length with the recipient.