Area Code 3621 – Hobart

Geographic Overview

The Australian area code 3621 is a geographic National Destination Code (NDC) assigned to the city of Hobart, the capital of Tasmania. It forms part of the larger numbering area (NNA) for Tasmania, which is designated by the prefix (03) in the national numbering plan. Specifically, the 3621 prefix is allocated to the Hobart central business district and its immediate surrounding suburbs, including North Hobart, South Hobart, and Battery Point. This code is used for fixed-line (PSTN) services, and since the rollout of the National Broadband Network (NBN), it also applies to VoIP-based fixed-line services that retain geographic numbering.

Dialing Formats

When calling a number that uses the 3621 prefix, the dialing format depends on the caller's location:

• Local calls (within Australia): Dial the full national significant number, which is 03 3621 XXXX. The leading '0' is the trunk prefix, and '3' is the NDC for Tasmania and Victoria. The total number length is 10 digits, including the trunk prefix.
• International calls (from outside Australia): Dial the country code for Australia, which is +61, followed by the NDC without the leading '0', and then the subscriber number. For example, to call a Hobart number with the 3621 prefix, you would dial +61 3 3621 XXXX.

It is important to note that the '0' is only used within Australia; when dialing from overseas, you must omit it. Always replace the leading '0' with the international access code of the country you are calling from, followed by 61.

Numbering and Overlays

Australia's geographic numbering plan does not use area code overlays in the traditional North American sense. Instead, the entire state of Tasmania, including Hobart, shares the single area code 03. This means that all fixed-line numbers in Tasmania, regardless of specific exchange, are dialed using the same trunk prefix and area code. The 3621 prefix is one of many within the 03 range that identifies the specific exchange or service area within Hobart. Because there is no overlay, local calls between different suburbs within Hobart do not require an additional area code; however, all calls within Australia must include the full 10-digit number (03 3621 XXXX) for fixed-line numbers.

Caller Instructions

For callers within Australia, it is essential to include the trunk prefix '0' when dialing any Australian fixed-line number. For example, a local call from a mobile phone to a Hobart landline would be dialed as 03 3621 XXXX. For callers from overseas, the number should be dialed as +61 3 3621 XXXX. Remember that the plus sign (+) represents the international access code, which varies by country (e.g., 011 from the US, 00 from most European countries). Always check the specific international dialing instructions for your country.

Regulatory and Technical Notes

The allocation and management of Australian telephone numbers are overseen by the Australian Communications and Media Authority (ACMA). The 3621 prefix is part of the public switched telephone network (PSTN) and is subject to local number portability, meaning that customers can retain their number when changing service providers, as long as they remain within the same geographic area. This prefix is not used for mobile services, which are identified by non-geographic prefixes starting with 04. For businesses and residents in Hobart, the 3621 prefix provides a stable and recognizable geographic identity, which is often preferred for local customer trust and marketing purposes.