Area Code 3 – Bas-Congo/Bandundu

Geographic Coverage and Administrative Jurisdiction

The +243 3 country calling code prefix is a geographic National Destination Code (NDC) assigned to the western provinces of the Democratic Republic of the Congo (DRC), specifically covering the former Bas-Congo (now Kongo Central) and Bandundu regions. This area includes major urban centers such as Matadi, the principal seaport and capital of Kongo Central, and Kikwit, a key commercial hub in the former Bandundu province. The code serves both fixed-line PSTN subscribers and, in some cases, fixed wireless terminals operating within these provinces.

Dialing Formats and Caller Instructions

For international callers, the complete number format is +243 3 XX XX XX, where the trunk prefix '0' is omitted. For example, a fixed-line number in Matadi might be dialed as +243 3 12 34 56. Domestic callers within the DRC must dial the trunk prefix '0' before the NDC, resulting in the format 03 XX XX XX. It is crucial to note that the DRC uses a closed numbering plan; therefore, local numbers are always seven digits after the NDC, and no area code omission is permitted even for on-net calls.

Numbering Plan and Overlay Considerations

As part of the national numbering plan administered by the Autorité de Régulation de la Poste et des Télécommunications (ARPTC), the +243 3 prefix is exclusively allocated to geographic fixed-line services. Unlike mobile prefixes (e.g., +243 8 or +243 9), this code is not portable across geographic regions, meaning a number assigned to the Bas-Congo region cannot be transferred to another province. There are no overlay codes currently in effect for this area; subscribers are required to dial the full NDC for all calls, including local ones.

Technical Routing and Service Considerations

From a technical standpoint, calls to +243 3 numbers are routed via the international gateway to the DRC's PSTN infrastructure, then switched to the appropriate regional exchange. Fixed-line services in this region may experience variable call quality due to infrastructure limitations, and some subscribers have migrated to VoIP or mobile alternatives. For enterprises, it is advisable to verify the availability of fixed-line connectivity in specific localities, as some rural areas may rely on satellite or wireless local loop solutions that still utilize the +243 3 NDC.

Practical Examples

• International call to a fixed line in Matadi: +243 3 45 67 89
• Domestic call from Kinshasa to the same number: 03 45 67 89
• International call to a fixed line in Kikwit: +243 3 98 76 54

When dialing from abroad, always replace the leading '0' of the domestic format with the country code +243. Ensure that you have the correct seven-digit subscriber number, as omitting digits will result in a failed call.