Area Code 266 – St. Helena

Geographic Overview and Administrative Coverage

The area code 266 is a geographic National Destination Code (NDC) assigned to the island of St. Helena, a British Overseas Territory located in the South Atlantic Ocean. This code covers the entire island, including its administrative capital, Jamestown, and other settlements such as Half Tree Hollow, Longwood, and Sandy Bay. As a geographic code, 266 is tied to the PSTN infrastructure of St. Helena, which is operated by Sure South Atlantic (formerly Cable & Wireless). The island's telephone network is fully digital and supports both fixed-line and mobile services, though the 266 prefix is primarily associated with fixed-line subscriptions.

Dialing Formats and Caller Instructions

When calling a St. Helena number from abroad, the international format is +290 266X XXXX, where the full national significant number (NSN) is eight digits, beginning with the NDC 266 followed by a five-digit subscriber number. For example, a typical number might be +290 266 12345. Local callers within St. Helena can dial the eight-digit number directly without the international prefix, i.e., 266 12345. It is important to note that St. Helena uses a single island-wide numbering plan, so there are no separate trunk prefixes or area codes beyond the NDC. Foreign callers must replace the international access code (00 or +) with their country's exit code, and then dial 290 followed by the NDC and subscriber number.

Overlay and Numbering Plan Considerations

Currently, there is no overlay code for St. Helena; the 266 NDC is the sole geographic code for the island. However, the numbering plan is administered by the Utilities Regulation and Competition Authority (URCA) of St. Helena, which has reserved capacity for future expansion. As of 2023, the island has a small population (around 4,000), and the number of assigned lines is limited. The 266 code is not subject to number portability between fixed-line operators, as there is only one fixed-line provider. Mobile services on the island use separate NDCs (e.g., 266 is fixed, while mobile numbers may start with 266 as well? Actually, mobile numbers in St. Helena also use the 266 NDC, but they are distinguished by the first digit of the subscriber number. For instance, mobile numbers often begin with 266 2 or 266 5, while fixed lines use other ranges. This is an important consideration for callers: the NDC alone does not indicate whether the number is fixed or mobile, but the subscriber number prefix can give a hint. However, for dialing purposes, the format remains the same.

Practical Calling Tips

For international callers, it is essential to check with your telecom provider for any special rates to St. Helena, as it is a remote territory with limited connectivity. Calls are routed via satellite or submarine cable (the Equiano cable, which landed in 2022, now provides fiber connectivity). VoIP services can also reach St. Helena numbers, but ensure that your provider supports dialing to +290. When dialing from a mobile phone, simply enter +290 266 X XXXX. From a landline, use the international prefix (e.g., 011 from the US, 00 from most European countries). Always verify the number length: St. Helena numbers are eight digits long, including the NDC. If you receive a call from an unknown number starting with +290 266, it is likely a legitimate call from the island, but be cautious of spoofing.