Area Code 37 – Aileu

Overview of Area Code 37 (Aileu, Timor-Leste)

Area code 37 is a geographic National Destination Code (NDC) assigned to the municipality of Aileu in Timor-Leste (East Timor). Timor-Leste uses a closed telephone numbering plan under the ITU-T E.164 standard, with country calling code +670. Geographic area codes are two digits (e.g., 21 for Dili, 37 for Aileu) and are followed by a subscriber number. The full national significant number (NSN) for a fixed-line subscriber in Aileu is 8 digits long, comprising the 2-digit area code and a 6-digit subscriber number. Therefore, a typical Aileu fixed-line number is formatted as +670 37X XXXX when dialed internationally.

Geographic Coverage and Administration

Aileu is one of Timor-Leste's 13 municipalities, located in the central-western part of the country, about 30 kilometers south of the capital, Dili. The area code 37 serves the entire municipality, including the administrative posts of Aileu Vila, Laulara, Lequidoe, and Remexio. The main town, Aileu, is the administrative center. The code is allocated to fixed-line services provided by Timor Telecom, the incumbent operator, and other licensed operators that offer PSTN services in the region.

Dialing Instructions

• Within Timor-Leste: To call an Aileu fixed-line number from another part of the country, dial the full 8-digit national number: 37X XXXX (no trunk prefix is used). For example, if the subscriber number is 123456, dial 37123456.
• From abroad: Dial the international access prefix (e.g., 00 or +), then the country code 670, followed by the 8-digit national number: +670 37X XXXX. For instance, +670 37123456.
• Local calls within Aileu: Even for calls within the same area, the full 8-digit number must be dialed, as Timor-Leste uses a closed numbering plan.

Overlay and Numbering Considerations

Timor-Leste's numbering plan does not currently employ overlays for geographic codes. Each municipality has a unique area code. However, number portability is not yet widely implemented for fixed lines, so a subscriber's area code generally reflects their physical location. As of 2023, the country has not introduced any additional digits to the NSN, but future expansions may occur due to increasing demand.

Practical Information for Callers

When calling an Aileu number from a mobile phone within Timor-Leste, you must still include the area code. International callers should note that Timor-Leste's country code is often confused with that of other nations, but +670 is exclusively assigned to Timor-Leste. Ensure you drop any leading '0' that might appear in local directories, as international format requires only the country code followed by the NSN.