Number porting is the process of moving your existing phone number from one provider to another. Under Australian telecommunications rules, you generally have the right to keep your number when changing providers, but the process must follow strict identity and authorisation requirements. For businesses, porting is often the highest-risk step in a cloud phone migration because incorrect account details, cancelled services, or poor cutover planning can lead to delays or temporary loss of service. The good news is that most porting problems are preventable with the right preparation.
What is number porting?
Number porting allows you to retain your existing business phone number when moving to a new telecommunications provider. This applies to most Australian geographic numbers (such as 03, 02, 07 and 08 numbers), mobile numbers, and many 13/1300 services, although the process and timeframes can differ depending on the service type.
ACMA oversees the regulatory framework for number portability, while the operational process is managed between the gaining provider (your new provider) and the losing provider (your current provider). In most cases, your new provider will coordinate the port on your behalf.
Before you submit a port request
The single biggest cause of port rejections is mismatched account information. The details on the port request must match the records held by your current provider, including the legal account name and service address.
Before signing a porting form, check your latest bill carefully and verify that the authorised contact person is still correct.
- Confirm the exact legal account holder name
- Verify the service address and billing account number
- Check every phone number that will be ported
- Ensure the person signing the authority is authorised to act for the business
- Avoid making account changes while the port is in progress
Do not cancel your old service first
This is one of the most important Australian porting rules. If you cancel the service with your current provider before the port is completed, the numbers may be disconnected and could become unavailable for porting.
Your new provider should advise you when the port has successfully completed and it is safe to close any remaining services that are no longer required.
Simple vs complex ports
Not all ports are the same. A single business number with no associated services is usually considered a simple port, while multiple numbers, ISDN services, SIP trunks, or 13/1300 numbers are typically treated as complex ports.
- Simple port: one or a few standard business numbers
- Complex port: bulk numbers, ISDN ranges, SIP services, or inbound network services
- Complex ports usually require additional validation and coordinated cutover planning
How long does porting take in Australia?
ACMA does not publish a single guaranteed timeframe for all business ports because the duration depends on the type of service and the cooperation of both providers.
As a general guide, simple business number ports are often completed within a few business days, while complex ports can take several weeks due to validation, scheduling, and testing requirements.
What happens on cutover day?
On the scheduled port date, calls will begin routing to the new provider. The change is usually completed within a defined porting window, but some carriers may update routing progressively.
At MCS, we use a structured cutover checklist to minimise disruption:
- Pre-port testing of inbound and outbound calling
- Verification of handset and softphone registration
- Confirmation of call queues, IVRs, and voicemail settings
- Live monitoring during the port window
- Post-port validation of every direct-in-dial (DID) number
- Fallback call forwarding plan if unexpected issues occur
After the port completes
Don’t assume everything is working just because one number can make a call. Test every inbound number, hunt group, IVR option, voicemail box, and outbound caller ID.
It’s also worth asking your new provider for a final list of ported numbers and checking it against your original authority form to ensure nothing was missed.
Common port rejection reasons
These are the issues we see most often in Australian business migrations:
- Incorrect legal entity name (for example, trading name instead of Pty Ltd)
- Wrong account number or billing reference
- Service address does not match carrier records
- Unauthorised signatory
- Numbers belong to a different carrier account
- The service has already been cancelled or disconnected
The safest way to approach a business port
For a single-site business, the safest approach is usually to install and test the new cloud phone system before the port date, then move the numbers once all users are trained and ready.
For multi-site businesses, we recommend a staged migration where non-critical numbers are ported first, followed by main reception numbers during a coordinated cutover window.