Optus Business Phone Alternatives for Small Business (2026)

Australian small businesses can switch their business phone service away from Optus without touching their internet connection. The two services are sold together but they operate independently -- your phone provider and your internet provider do not have to be the same company, and in most cases separating them gives you more flexibility and lower cost. This guide explains why businesses are leaving Optus business phone, what unbundling actually means in practice, how to port your numbers away, and what to look for in a replacement provider. It is written for Australian small businesses on NBN connections who want a plain-English answer rather than a sales pitch.

Why Businesses Are Leaving Optus Business Phone

The complaints from small businesses leaving Optus business phone tend to cluster around the same themes. This is not about Optus being uniquely bad -- the same patterns appear with Telstra and the other large carriers. It is about the structural mismatch between what a large telco is designed to do and what a small business actually needs.

Bundled Contracts and Inflexibility

Optus business plans are commonly sold as bundles -- internet plus phone, sometimes with mobile included. Bundles can look attractive on the surface, but they create a problem: if you want to change one part of the bundle (say, switch your phone service to a specialist VoIP provider), you often have to renegotiate the entire bundle or pay an early termination fee. The components are priced as a unit, so leaving one part rarely saves you what you expect.

For a small business that just wants to make and receive calls reliably without being tied to a contract, this bundling model creates unnecessary friction.

Support Quality and Offshore Call Centres

This is the most common complaint. When something goes wrong with a business phone service -- a number that stops working, a porting request that stalls, a billing error -- small businesses need to talk to someone who can actually resolve the issue. With a large carrier, that typically means a wait, a transfer, a script, and an outcome that may take days to resolve. The person answering the call often does not have the tools or authority to fix the problem on the first contact.

Specialist VoIP providers, by contrast, tend to be smaller and more responsive. The person you speak to usually handles the issue directly rather than escalating through multiple tiers.

Being Pushed Into Broadband-Plus-Voice Bundles

As Optus migrates its customer base off legacy PSTN (traditional phone lines, which were switched off in 2025 as part of the NBN rollout), many small businesses have been placed onto a VoIP service delivered through their Optus NBN modem -- the green phone port on the back of the router. This service is convenient but it is not a real business phone system. It is a basic single-line analog service with no business features, controlled entirely by Optus, and with no ability to add extensions, call routing, or the features most businesses eventually need.

Optus does offer separate business VoIP products, but these are typically upsold at significantly higher prices when the green port service proves insufficient. Many businesses discover that a specialist VoIP provider delivers better features at a lower price point.

The Optus Bundle Trap Explained

The bundle trap is simple: Optus prices their internet and phone together in a way that makes the individual components look expensive if priced separately. The intent is to make switching one component feel financially painful -- even if switching delivers a better service.

Here is what actually happens when you look at the numbers:

• Your Optus NBN plan has a monthly fee. This is for your internet connection. It does not change if you switch your phone service.
• Your Optus business phone service has a separate component (sometimes billed as a line or voice add-on). This is what you are actually switching.
• The voice add-on component from Optus typically costs more per month than an equivalent service from a specialist VoIP provider -- and includes fewer features.

The financial argument for bundling is that you get a discount when you take both services together. But the relevant question is not whether bundling is cheaper than Optus internet plus Optus phone separately -- it is whether Optus internet plus a specialist VoIP provider is cheaper and better than Optus internet plus Optus phone. In most cases, it is.

You Do Not Need to Change Your Internet to Change Your Phone Provider

This is the single most important thing to understand. Your internet service and your phone service are completely separate technologies. Your VoIP phone service uses your internet connection to carry calls, but it does not care which internet provider you use. Optus NBN, Aussie Broadband, Superloop, Telstra -- the phone works the same on all of them.

Switching your phone service to a specialist VoIP provider while keeping your Optus NBN internet is a normal, common arrangement. You do not need to contact Optus about your internet service at all. You simply sign up with a new phone provider, port your number across, and configure your phones.

Many Optus customers stay with Optus internet because they are happy with the connection speed and price. That is a completely valid choice. The point is that choosing your phone provider is a separate decision and should be made separately.

This is also worth knowing if you are currently in a lock-in contract for Optus internet -- you can still switch your phone service while staying on your NBN contract. There is no dependency.

What Optus Business Phone Actually Costs When You Unbundle It

When you separate the Optus phone component from the bundle and price it independently, the cost picture often looks different. A few things to look for:

• Line rental component: What is the monthly cost of the voice add-on, stripped of any bundle discount? This is the baseline you are replacing.
• Per-minute call rates: Optus business plans vary in what they include. Check the specific rate for calls to Australian mobiles -- this is where most businesses spend most of their call budget.
• 1300 number charges: If you run a 1300 number through Optus, check what you are paying in answered call charges per minute.
• Contract term: If you are in a 12 or 24 month business contract, check the early termination fee before switching.

Compare these figures against a like-for-like quote from a specialist VoIP provider. For a detailed breakdown of what to look for in a cost comparison, see our VoIP cost guide and our article on hidden VoIP costs.

What to Look For in a Replacement

When evaluating alternatives to Optus for business phone, the following criteria matter for Australian small businesses specifically:

Australian-Owned and Australian-Based Support

The main reason businesses leave large carriers is support quality. Replacing Optus with another large provider that uses offshore scripts and long wait times solves nothing. Look for providers with Australian ownership and local support staff who can actually resolve issues on the first call. There are specialist Australian VoIP providers in the market that operate this way. Ask specifically: where is your support team based, and what are your support hours?

Month-to-Month Contracts

Month-to-month plans are available in the Australian VoIP market and are standard with many specialist providers. A month-to-month contract protects you: if the service does not meet your needs, you can leave without a penalty. Be cautious of any provider that requires a 12 or 24 month commitment for a standard small business phone service -- this is more about locking you in than delivering genuine value.

Number Porting Support

Confirm that the new provider will port your existing number across from Optus before you sign up. This is standard practice but worth confirming explicitly. Also ask: how long does porting take, and what happens to calls during the porting window? A reputable provider will give you a clear, specific answer. The porting process in Australia typically takes 5-10 business days for geographic numbers.

Our number porting guide covers the full process and what can go wrong.

Features That Match Your Business Size

Make sure the replacement service actually includes the features you need. At a minimum for most small businesses, this means: multiple simultaneous calls, voicemail to email, after-hours call routing, and basic call management. If you need call recording, ring groups, or an IVR menu (the "press 1 for sales, press 2 for accounts" system), check whether these are included or cost extra. See our guide to VoIP phone systems for small business for a full feature comparison.

How to Port Your Numbers Away From Optus

Porting your business number from Optus to a new provider is a regulated process in Australia. You do not need Optus's permission to port your number -- they are legally required to release it. Here is how the process works:

1. Sign up with your new provider first. Do not cancel your Optus service. Initiate the port through the new provider's process. They manage the port on your behalf.
2. Provide your number details to the new provider. You will need your Optus account number and the number(s) you want to port. You may also need the name on the Optus account.
3. Wait for the port to complete. The process typically takes 5-10 business days for geographic numbers. Your new provider will confirm a porting date.
4. Test the new service before porting. Set up your VoIP phones and test everything on a temporary number before the port date if possible. This way, any configuration issues are resolved before your main number moves.
5. Cancel Optus after the port completes. Once your number is confirmed live on the new service, cancel the Optus phone component. Keep your Optus internet if you want to.

Note: if your number is currently attached to an Optus broadband bundle, the port process removes the voice component only. Your internet service continues unchanged.

For a detailed walkthrough of the migration process, see our guide to migrating from a landline to VoIP in Australia.

What Most Businesses Get Wrong

Mistake 1: Cancelling Optus Before the Port Completes

Cancelling your Optus service before the number port has completed will release your number back into the pool -- you lose it permanently. Always wait for the new provider to confirm the port is complete and the number is live on the new service before contacting Optus to cancel. This is the most common and most damaging mistake in a phone provider switch.

Mistake 2: Assuming You Need to Switch Internet to Switch Phone

Many businesses delay switching their phone service because they assume it is tied to their internet contract. It is not. You can switch your phone service to any specialist VoIP provider while keeping your Optus NBN connection exactly as it is. The two services are entirely independent. Keeping your internet with Optus while moving your phone to a better-suited provider is a common and perfectly valid arrangement.

Mistake 3: Choosing a New Provider Based on Monthly Price Alone

Switching away from Optus to save money is reasonable -- but choosing the replacement based on the lowest monthly plan price without checking mobile call rates, feature inclusions, and support quality often results in switching again within six months. The total cost of ownership includes call costs, porting fees, hardware costs if needed, and the time cost of dealing with support issues. A slightly higher monthly fee from a provider with excellent local support and better feature inclusion often works out cheaper over a year. Use our VoIP Cost Calculator to compare the full picture, not just the plan price.

Your Next Steps

If you are ready to move your business phone service away from Optus, here is the practical sequence:

1. Check your current Optus contract. Is there a minimum term or early termination fee on the phone component? If yes, note when it expires. If you are month-to-month, you can move anytime.
2. Write down your requirements. How many staff need phones? How many simultaneous calls do you need to handle? What features do you need? This takes 10 minutes and prevents choosing a plan that does not fit.
3. Get quotes from at least two specialist Australian VoIP providers. Ask specifically for the per-minute rate for Australian mobile calls, the monthly line rental, and whether your number can be ported from Optus.
4. Use the Cost Calculator to compare total monthly cost. Include call volume estimates, not just headline prices.
5. Sign up with the new provider and initiate the port. Do not cancel Optus until the port is confirmed complete.
6. Test the new service on a temporary number before the port date. Make sure calls work, voicemail works, and any features you need are configured correctly.
7. After the port completes, cancel the Optus voice component. Keep the NBN internet if you want to.

If you would like a recommendation on which type of service suits your business, the NTK Comms team can help assess your requirements and point you in the right direction.

Can I switch my business phone away from Optus while keeping my Optus internet?

Yes. Your internet connection and your phone service are completely independent. You can switch your business phone to any VoIP provider while keeping your Optus NBN plan exactly as it is. The new VoIP service runs over your existing internet connection regardless of who provides it. You do not need to contact Optus about your internet service at all when switching your phone provider.

How do I port my business phone number away from Optus?

Sign up with your new VoIP provider first -- do not cancel Optus. Ask the new provider to initiate the port. You will need your Optus account number and the number(s) you want to transfer. The process takes 5-10 business days for geographic numbers. Once the new provider confirms the port is complete and your number is live on the new service, you can contact Optus to cancel the phone component. Never cancel Optus before the port completes -- you will lose your number permanently.

What is the green phone port on my Optus modem and is it a proper business phone service?

The green phone port on the back of most ISP-supplied modems (including Optus ones) is an ATA -- an Analog Telephone Adapter. It converts your old-style analog handset to work over your NBN connection. Optus controls the settings, you do not get SIP credentials, and the service typically supports only one call at a time with no business features. It is a basic migration service, not a business phone system. If you need multiple simultaneous lines, call routing, voicemail to email, or any business functionality, you need a proper VoIP service from a specialist provider.

Will I lose service during the number porting process?

Brief interruption during the cutover is possible -- typically measured in minutes, not hours, for geographic numbers in Australia. The actual cutover happens at a specific time on the agreed porting date. Most specialist VoIP providers will work with you to schedule the cutover at a low-traffic time (such as early morning) to minimise disruption. You can also keep a mobile number available as a backup during the porting window. Our number porting guide covers how to prepare for this.

What features should I expect from a VoIP replacement for Optus business phone?

At a minimum, a business-grade VoIP service should include: multiple simultaneous calls on the same number, voicemail to email (so you never miss a message), after-hours call routing (automatically sending calls to voicemail or a mobile after hours), and a local Australian phone number. Most specialist providers also include call queuing, basic IVR (auto-attendant), and ring groups in their standard business plans. Call recording and advanced integrations are available at higher price points. See our VoIP phone system guide for a full breakdown of what to expect at each level.

Is there a minimum contract if I switch to a specialist VoIP provider?

Many specialist VoIP providers in Australia offer month-to-month plans with no lock-in. This is one of the advantages of switching away from a large carrier bundle -- the flexibility to leave if the service does not meet your needs. Some providers offer discounts for annual payment if you want to reduce monthly costs. Always confirm the contract terms before signing up and check for any early termination fees, even on month-to-month plans where cancellation notice periods may apply.

What happens to my Optus 1300 number if I switch providers?

1300 numbers can be ported between providers in Australia just like geographic numbers. The process is managed through ACMA's Numbering Plan and typically takes a similar timeframe to geographic number porting. Your new VoIP provider handles the port request. Confirm with the new provider that they support 1300 number porting and ask about any associated costs before signing up. Note that answered call charges on your 1300 number may be structured differently with the new provider -- check the per-minute rate for calls from both landlines and mobiles.