New Zealand mobile prefixes explained
By the StoryCheck team · 4 min read · Published 18 August 2026
The first digits of a New Zealand number tell you the line type reliably and the carrier unreliably. That distinction matters, because the carrier is the part most people try to read and the part that has been wrong since number portability arrived.
Mobile ranges
021 was originally Vodafone, now One NZ. 027 was Telecom, now Spark, and is very common among tradespeople and small businesses. 022 was 2degrees. 020 covers newer allocations including Skinny and resellers. None of those associations are dependable today, because a number keeps its prefix when it moves network.
Portability means a 027 number may have sat on a different network for a decade. Treat the prefix as line type, not as a carrier.
Geographic codes
New Zealand uses single-digit regional codes: 09 for Auckland and Northland, 07 for Waikato and Bay of Plenty, 06 for Taranaki through Hawke's Bay, 04 for Wellington, and 03 for the entire South Island. A geographic number does point at a region, and that region should match what a caller claims about themselves.
The ranges that cost money
0800 and 0508 are freephone and cost you nothing to ring. 0900 is premium rate and costs you per minute, which is why returning a 0900 call you did not start is the one clearly wrong move. If you want to know what a specific number actually is, including whether it is a VoIP line, a lookup reports the line type directly.
| Prefix | Line type | What it does not tell you |
|---|---|---|
| 021 | Mobile, historically One NZ | The current network, after portability |
| 022 | Mobile, historically 2degrees | The current network |
| 027 | Mobile, historically Spark | The current network |
| 020 | Mobile, newer allocations | Whether the holder is established or brand new |
| 09 / 07 / 06 / 04 / 03 | Geographic landline by region | Whether the caller is actually in that region |
| 0800 / 0508 | Freephone, free to ring back | Whether the organisation is genuine |
| 0900 | Premium rate, charged per minute | Nothing safe. Do not ring these back. |
Common questions
Can I tell which network a 021 number is on?
Not reliably. Number portability lets a number move between carriers while keeping its prefix, so the historic association is a hint at best.
Does the prefix tell me where someone lives?
For a geographic landline, roughly yes. For a mobile, no. A mobile prefix carries no location at all, and people keep numbers when they move.
How do I know if a number is a VoIP line?
Not from the prefix. VoIP numbers can appear in ordinary ranges, so identifying one requires a lookup that reports line type.
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