Area Code 402 – Taichung/Changhua

Overview of Taiwan Area Code 402

Area code 402 is a geographic National Destination Code (NDC) within the Taiwan telephone numbering plan, assigned to the central-western region of the island, primarily covering the city of Taichung and parts of Changhua County. This code is part of the E.164 international dialing structure for Taiwan, which uses the country calling code +886. When dialing a number in this region from abroad, callers must use the international format: +886 402 XXX XXX (or the appropriate local number length). Domestically, the trunk prefix 0 is used, so local callers dial 04 02 XXX XXX (with the leading 0 dropped when calling from outside Taiwan).

Geographic Coverage and Administrative Jurisdiction

The 402 area code serves the urban and suburban districts of Taichung City, a special municipality, and extends into adjacent areas of Changhua County. Taichung is a major economic and cultural hub in central Taiwan, with districts such as Central, West, North, South, and Xitun falling under this code. The code also covers parts of Changhua's northern townships that are within the Taichung metropolitan area. This allocation is managed by the National Communications Commission (NCC) of Taiwan, which oversees the country's numbering plan in accordance with ITU-T E.164 recommendations.

Dialing Formats and Caller Instructions

For local callers within Taiwan, the dialing format is 04-02XXXXXX (where X represents the subscriber number). For example, a local call to a number in Taichung would be dialed as 04 02 123456. When calling from a mobile phone within Taiwan, the same format applies. For international callers, the format is +886 402 123456 (or +886402123456 when entered in a phone's international dialing field). It is crucial to omit the leading 0 of the area code when dialing from abroad. For example, to call a Taichung landline from the United States, one would dial 011 886 402 123456 (using the US exit code).

Overlay and Numbering Considerations

Taiwan has implemented overlay plans in some regions to increase numbering capacity. However, as of the latest updates, the 402 code does not have an overlay; it is a distinct code within the larger 04 numbering area, which also includes other codes such as 403, 404, etc., for different districts. Callers should always verify the exact number of digits, as subscriber numbers can vary in length. The NCC ensures that geographic codes like 402 are used exclusively for fixed-line services, and they are not portable to mobile networks. Mobile numbers in Taiwan start with 09 and are non-geographic.

Practical Usage and Business Implications

For businesses, having a 402 number signals a physical presence in Taichung or Changhua, which can enhance local trust and customer service. When setting up VoIP systems or virtual numbers, ensure that the service provider routes calls correctly to the PSTN. For international callers, using the correct +886 format is essential to avoid misdialing. Always confirm the subscriber number length with the called party, as it may range from 6 to 8 digits after the area code.