Area Code 4008 – Taichung/Changhua

Overview of Area Code 4008

Area code 4008 is a geographic numbering resource within the Republic of China (Taiwan) national numbering plan, administered by the National Communications Commission (NCC). It is allocated to the Taichung and Changhua metropolitan regions, serving a densely populated corridor in west-central Taiwan. This code is part of the 04 numbering group, which historically covers central Taiwan, including Taichung City, Changhua County, and Nantou County. The 4008 prefix is a central office code, identifying a specific exchange or service area within the broader 04 destination network.

Geographic Coverage and Administrative Jurisdiction

The 4008 code is assigned to exchanges in the Taichung-Changhua metropolitan area, which includes Taichung City (the second-largest city in Taiwan) and the surrounding Changhua County. This region is a major economic and cultural hub, home to the Taichung Science Park, the Port of Taichung, and numerous industrial and commercial districts. The code serves both residential and business customers within its designated exchange boundaries, which may span multiple administrative districts.

Dialing Formats and Caller Instructions

For callers within Taiwan, the national dialing format requires the leading trunk prefix '0' before the area code. Thus, to call a number in the 4008 area, you would dial: 0 4 4008 XXXX (where XXXX is the subscriber number). For example, a local number might be 04 4008 1234. When calling from abroad, the international format omits the trunk prefix '0' and uses Taiwan's country code +886. The international dialing format becomes: +886 4 4008 XXXX. For instance, an international caller would dial +886 4 4008 5678.

It is important to note that Taiwan has implemented number portability for both fixed-line and mobile services. Therefore, a number with the 4008 prefix may have been ported to a different service provider, but the geographic significance remains tied to the original exchange. Callers should always use the full national or international format to ensure proper routing.

Overlay and Future Considerations

The 04 area code is not overlaid with additional area codes; it remains the sole geographic code for the central region. However, as demand for numbers grows, the NCC may introduce new central office codes or reallocate existing ones. For now, 4008 remains a stable and active prefix within the Taichung-Changhua region, serving both legacy PSTN and VoIP-based fixed-line services.

For businesses and residents, understanding the correct dialing format is essential for seamless communication. Whether you are placing a local call from Taipei or an international call from the United States, using the proper country code and area code ensures your call reaches its intended destination without error.