Area Code 33 – Kolonga

Overview of Tonga's +676 33 Geographic Prefix

The international dialing code +676 is assigned to the Kingdom of Tonga under the ITU-T E.164 international numbering plan. Within this national plan, the prefix 33 serves as a Geographic Area Code, specifically allocated to the Kolonga district, located on the main island of Tongatapu. This prefix is used for fixed-line (PSTN) services, and numbers under this range are typically 5 digits long after the country code and area code, resulting in a full international format of +676 33XXX (where X represents the subscriber's unique line number).

Geographic Coverage and Administrative Context

Kolonga is a rural district situated on the eastern coast of Tongatapu, the principal island of Tonga, which hosts the capital city of Nuku'alofa. The area is known for its agricultural communities and coastal villages. The 33 prefix is part of Tonga's closed numbering plan, meaning that local calls within Tonga require dialing the full national significant number, which includes the area code and the subscriber number. For example, to call a fixed line in Kolonga from within Tonga, a caller would dial 33XXX (without the international prefix or country code).

Dialing Instructions for Local and International Callers

• Local calls (within Tonga): Dial the 5-digit number directly, e.g., 33XXX.
• International calls from abroad: Dial your country's international exit code (e.g., 00 from most countries, 011 from the US/Canada), followed by Tonga's country code 676, then the area code 33 and the subscriber number. For example, from the US, you would dial 011 676 33XXX.
• Calls from Tonga to another country: Dial the international prefix 00, then the destination country code, area code, and subscriber number.

Regulatory and Technical Considerations

The Tonga Communications Corporation (TCC) is the primary fixed-line operator and manages the allocation of geographic prefixes. As of recent years, Tonga has not implemented number portability for fixed-line services, so the 33 prefix remains a reliable indicator of a subscriber's geographic location. The numbering plan follows the ITU-T E.164 recommendation, ensuring global interoperability. For VoIP or mobile users, it is important to note that this prefix is exclusively for fixed-line services; mobile numbers in Tonga typically begin with 7 or 8 and are non-geographic. When dialing from abroad, always ensure you have the correct international exit code and omit any leading '0' that might be used in domestic dialing formats.