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Switching mobile providers in New Zealand while keeping your existing phone number is a regulated process that most customers can complete within hours. However, the number porting relies on the gaining provider to initiate the switch and on the customer to keep their old mobile service active until the transfer completes.
How the porting system works
Number portability is a regulated right in New Zealand. The Telecommunications Act sets out rules for both fixed-line and mobile number portability. The Commerce Commission oversees the framework, which ensures customers can keep their phone number when switching between carrier-based telecommunications companies.
The Telecommunications Forum facilitates the porting process between networks. This independent industry body handles the behind-the-scenes coordination to enable customers to move their number from one provider to another.
Under the Commerce Commission's rules, customers can port their number multiple times between different carriers. The industry handles thousands of number ports every week.
The regulated process limits the time a customer is without service and caps the fees telecommunications companies charge each other for number ports. But to ensure a smooth transfer, customers still need to follow the right handover steps on their end.
What to do before you switch
To port your mobile number when changing providers, you start by signing up for a new service. Once your account is set up with the gaining provider, they will begin the porting process on their side.
The new provider will ask for the details it needs to request your number: your current account number, the exact account name, and whether your old service is prepay or on-account.
Throughout the port, keep your old mobile service running. Do not cancel the service yourself before the port completes, as this can disrupt or delay the transfer. Once the port is done, insert your new SIM when prompted and try test calls, texts, and mobile data.
Timing and service disruption
The exact timing of a port depends on when your new provider starts the transfer. Many ports complete within a few hours, especially when they are started during business hours.
Expect a short break in service while the number moves across. If the port has not completed after a business day, contact the new provider first: it runs the process and can see where the request is stuck.
SIMs, activation, and handsets
When to swap out your SIM card depends on the porting instructions from your new provider. As a general rule, wait for them to tell you it's time to switch over.
What can go wrong
If you cancel your old mobile service yourself before the port concludes, it can make the transfer fail. The key to a clean customer handover is to supply all the details the new provider needs and to let them do the paperwork.
Ports can also fail when the account number or name does not match what the old provider holds. Porting does not cancel a fixed-term contract: if you are still inside a contract or paying off a handset, early termination fees or the remaining handset balance may still be due to the old provider.
Contracts, credit, and exit charges
Prepay credit usually stays with the old provider and is not transferred with the number, so use it up before switching where you can. Check with your old provider whether your handset is locked to its network, and ask the new provider whether it can supply an eSIM if your phone supports one.
In summary, porting your mobile number to a new provider in New Zealand is a simple process most of the time. Pulling it off, though, relies on keeping your old service live until the port completes. Best practice is to let the new provider lead and focus on all the details they request.
