Cheap Business Phone Service Australia: What to Look For (and What to Avoid)

The cheapest business phone services in Australia currently start from around $5 per month including GST for a virtual number with a smartphone app, and from around $8 per month including GST for a pay-as-you-go VoIP line. Those headline prices are real -- but they are almost never what a business actually pays once calls to Australian mobiles, 1300 charges, and setup costs are included. This guide covers the full picture: what each price tier includes, where the hidden costs appear, and how to calculate your real monthly spend before you sign anything. It is written for Australian businesses on NBN connections, covering the pricing structures you will actually encounter in the local market.

What Do the Cheapest Business Phone Plans Actually Include?

There are two distinct categories at the low end of the Australian business phone market. Understanding the difference matters before you choose.

Virtual Number with Smartphone App (from ~$5/month incl GST)

A virtual number service gives you an Australian phone number that rings an app on your smartphone -- no physical desk phone involved. You answer calls on your mobile, and calls come in through the app rather than your mobile number. At this price point, you typically get:

• One local or 1300 number
• A basic softphone app (iOS and Android)
• Voicemail -- sometimes with email delivery, sometimes not
• No included call minutes, or a very small allowance
• No ability to handle two calls simultaneously on the same number

This is the right tool for a sole trader or micro-business that receives a handful of calls per week and simply wants a dedicated business number that does not expose their personal mobile. It is not a replacement for a business phone system -- it is a number forwarding service.

Pay-As-You-Go VoIP Line (from ~$8/month incl GST)

A PAYG VoIP line is a step up. This is a real internet-based phone line (the technology is called Voice over IP, or VoIP) that can connect to a physical desk phone or a softphone app on your computer. At the entry level, you get:

• One VoIP extension (also called a SIP line -- SIP is the technical protocol used)
• No included call minutes -- you pay per call
• Voicemail to email, usually
• Compatible with most standard VoIP desk phones
• Ability to add more lines as your business grows

The $8/month figure covers the line rental only. Actual call costs are on top, and this is where most businesses get surprised.

The Hidden Costs That Blow Out a Cheap Plan

Most businesses that switch to a cheap VoIP plan and then switch again within six months report the same experience: the monthly bill was two to three times the headline price. Here is where those extra costs come from.

Calls to Australian Mobile Numbers

This is the single biggest cost surprise for Australian businesses. Calls to Australian landlines are cheap -- typically 1-3 cents per minute or included in a plan. Calls to Australian mobile numbers cost significantly more -- typically 10-25 cents per minute on PAYG plans, or more depending on the carrier.

For most businesses, the majority of outbound calls go to mobile numbers. A 10-minute call to a supplier's mobile at 20 cents per minute costs $2. If you make 50 outbound calls to mobiles per month, you are spending $20-$100 on call costs alone -- before considering your line rental. Check what your actual mobile call rate is before committing to any plan.

1300 and 1800 Number Charges

If you operate a 1300 number, there is a cost the network owner (that is you) pays every time someone calls it. This is called the answered call charge, and it applies on top of your monthly number fee. Under current ACMA regulations, 1300 calls from landlines are free to the caller -- but the business pays a per-minute charge for the call. Rates vary by provider but are typically 10-20 cents per minute from landlines and 20-45 cents per minute from mobiles.

If your 1300 number handles significant inbound call volume, this cost can easily exceed your line rental. It is a recurring cost that does not appear on the plan comparison page.

Number Porting Fees

If you are moving an existing business number to a new provider -- keeping the same number your customers already know -- there is usually a porting fee. In Australia, this typically ranges from $20 to $75 per number depending on the provider and the type of number being ported. Geographic numbers (02, 03, 07, 08) and mobile numbers port through a regulated process managed by the Communications Alliance. The process takes 5-10 business days in most cases. Budget for this cost upfront -- it is not optional if you want to keep your existing number.

See our guide to number porting in Australia for the full process and what can go wrong.

Hardware Costs

A basic VoIP desk phone costs between $80 and $200 including GST. You do not have to use one -- a softphone app on your computer or mobile works fine -- but many businesses prefer physical phones. This is a one-off cost, but it adds to the total cost of switching. Some providers include or subsidise a basic handset; most do not at the entry-level price point.

Setup and Activation Fees

Some providers charge a one-off setup or activation fee ranging from $0 to around $50. Others embed this in the first month's bill. Read the fine print carefully -- the cheapest monthly rate sometimes comes with the highest setup cost.

How to Calculate Your Real Monthly Cost

Before comparing plans, work out your actual usage. You need to know:

1. How many outbound calls do you make per month? Roughly how many go to landlines vs. mobile numbers?
2. How many inbound calls do you receive per month? Do you have a 1300 number that callers use?
3. How many staff need phone access simultaneously? If two people need to take calls at the same time, you need at least two lines.
4. Do you need any features beyond basic calling? Call recording, IVR menus, ring groups, and voicemail-to-email all affect which plan tier makes sense.

Once you have those numbers, you can apply the real per-minute rates to your call volume and compare the total monthly cost -- not just the headline plan price.

Our VoIP Cost Calculator does this automatically. You can also read through the detailed breakdown in our guide to VoIP costs in Australia and our article on hidden VoIP costs.

What Each Price Tier Gets You

The table above is a guide to typical price ranges in the Australian market as of early 2026. Specific pricing varies significantly between providers -- always request a full quote that includes your expected call volume.

What You Lose on the Cheapest Plans

The very cheapest plans save money on monthly fees but remove things that matter for most businesses. Before choosing the lowest price point, check whether the following are included:

• Multiple simultaneous calls: If your number can only handle one call at a time, a second caller gets a busy signal. For a business receiving more than a handful of calls per day, this loses customers.
• Call queuing: The ability to hold callers in a queue when all lines are busy, with hold music rather than a disconnected line.
• After-hours routing: Automatically sending calls to voicemail or a different number outside business hours. On the cheapest plans, you often have to set this up manually.
• Voicemail to email: Receiving voicemail messages as audio files to your email inbox so you do not miss them.
• Call recording: Not available on entry-level plans and often requires a higher tier or add-on cost.
• Number porting: Some very cheap plans do not support porting your existing number in. You would have to start fresh with a new number -- which may not be acceptable if your existing number appears on your website, signage, and marketing.

Whether these matter depends on your business. A sole trader who receives five calls a week can live without all of them. A business with multiple staff handling daily enquiries cannot.

When to Spend a Bit More

There are specific situations where the entry-level price point is not the right choice, even if it looks appealing.

• You have five or more staff who take calls. At this point, you need a hosted PBX (a phone system in the cloud) that can route calls between extensions. Entry-level plans are not designed for this, and trying to force them into this role creates ongoing problems.
• You handle more than around ten calls per day. At this volume, call quality, simultaneous line capacity, and call management features start to matter. A plan that cannot handle two simultaneous calls will cost you more in lost business than you save on the monthly fee.
• You need call recording. This is common in businesses with compliance requirements (financial services, legal, healthcare) or businesses that want to review calls for quality purposes. It is almost never available at the entry-level price point.
• You have a 1300 number that drives significant inbound volume. The per-minute answered call charges on a 1300 number can make your cheap plan very expensive. At higher call volumes, a plan with better 1300 inclusions often works out cheaper overall.

If any of these apply, read our guide to total cost of ownership for business phone systems before making a decision.

What Most Businesses Get Wrong

Most businesses that have a bad experience with a cheap phone plan made one of three mistakes.

Mistake 1: Comparing Plan Price Without Checking Mobile Call Rates

The headline monthly cost is only part of what you pay. If 70% of your outbound calls go to Australian mobile numbers -- which is typical for most Australian businesses -- the per-minute rate on mobile calls often costs more than the plan fee itself. Always ask: what is the per-minute rate for calls to Australian mobiles? Get it in writing before committing.

Mistake 2: Not Accounting for Number of Simultaneous Calls Needed

Many entry-level plans provide a single line -- meaning one call in or out at a time. If you have two staff who both need to be able to make or receive calls simultaneously, you need two lines. If you add the cost of two or three lines, the cheap plan often no longer looks cheap. Work out how many simultaneous calls your business needs to support before comparing prices.

Mistake 3: Ignoring the Cost of Switching Again if It Does Not Work

Number porting is not free and is not instant. If you switch to the cheapest plan, discover it does not meet your needs after a few months, and then switch again, you pay porting fees twice, you may have to manage service disruption twice, and you spend time on it that has a real cost. Choosing slightly better than the minimum from the start is almost always cheaper in the long run. See our guide to migrating to VoIP for what the switching process actually involves.

Your Next Steps

Before you sign up for any business phone plan in Australia, work through this checklist:

1. Count your monthly calls. Estimate inbound and outbound separately, and note how many go to mobile numbers vs. landlines.
2. Decide how many simultaneous calls you need to support. If two staff need phones, assume you need at least two simultaneous lines.
3. List the features you cannot operate without. Voicemail to email, after-hours routing, and call recording are common must-haves. Write them down before comparing plans.
4. Ask every provider for their mobile call rate. Do not take the plan page at face value -- request a complete rate card.
5. Calculate your total monthly cost using your actual call volume. Use the VoIP Cost Calculator or do the maths manually: (number of minutes to mobiles x mobile rate) + (number of minutes to landlines x landline rate) + line rental + any 1300 answered call charges.
6. Factor in porting fees and hardware costs if you are switching from an existing provider.
7. Check whether the plan is month-to-month or has a minimum term. Month-to-month contracts are available in the Australian market and give you the flexibility to switch if the plan does not work out.

For a more detailed assessment of what your business needs, use our Phone System Sizing Wizard.

What is the cheapest business phone service available in Australia?

The cheapest options start from around $5 per month including GST for a virtual number with a smartphone app, or around $8 per month including GST for a basic PAYG VoIP line. These headline prices do not include call costs, which are charged per minute on top of the monthly fee. The actual total depends heavily on your call volume and whether you call Australian mobile numbers frequently.

Can I keep my existing business phone number if I switch to a cheap VoIP plan?

Usually yes, but not always. Most Australian VoIP providers support number porting for geographic numbers (02, 03, 07, 08 prefixes) and most mobile numbers. Some very cheap or entry-level plans do not support porting -- check this before signing up if keeping your number is important. Porting typically takes 5-10 business days and costs between $20 and $75 per number depending on the provider.

Why are calls to Australian mobile numbers so much more expensive on cheap VoIP plans?

In Australia, calls to mobile numbers are routed through a different part of the network and attract higher termination charges than calls to landlines. This is a regulatory and infrastructure reality, not a provider choice -- every provider pays more to terminate calls on Australian mobile networks. The difference is significant: landline calls are often 1-3 cents per minute, while mobile calls are typically 10-25 cents per minute on PAYG plans. Because most Australian businesses make the majority of their outbound calls to mobiles, this is often the biggest cost on a phone bill.

Do cheap VoIP plans work on NBN?

Yes, VoIP works on NBN -- it is actually the technology NBN was designed around. However, call quality depends on your NBN connection type and speed. FTTP (Fibre to the Premises) and FTTC (Fibre to the Curb) connections generally produce excellent call quality. FTTN (Fibre to the Node) connections can introduce jitter and packet loss that degrades call quality, particularly if your line speed is marginal. Before switching, check your NBN connection type and run a speed test. A minimum upload speed of around 1 Mbps per simultaneous call is typically required. Our NBN VoIP setup guide covers this in detail.

Is there a minimum contract on cheap business phone plans?

Many providers in the Australian market offer month-to-month contracts with no lock-in, even at entry-level price points. Some offer discounts for annual payment. The presence of a minimum contract is not correlated with plan price -- some of the cheapest plans are month-to-month, and some mid-tier plans lock you in for 12 or 24 months. Always check the minimum term before signing. Month-to-month is strongly preferred for most small businesses, especially if you are unsure whether the plan will meet your needs.

Can I use my existing analog handset (like a Panasonic or Uniden from JB Hi-Fi) with a cheap VoIP plan?

Not directly. Standard analog handsets connect to a phone wall socket, not to a VoIP service. To use an analog handset with a VoIP plan, you need a small hardware adapter called an ATA (Analog Telephone Adapter), which converts the analog signal to digital. These cost around $50-$120. Alternatively, you can use a VoIP-native desk phone (these connect via an ethernet cable rather than a phone socket) or a softphone app on your computer or smartphone, which requires no extra hardware. See our guide to ATA adapters for details on using analog phones with VoIP.

What happens to my VoIP phone if the power goes out?

Unlike a traditional landline, VoIP phones depend on your internet connection, which depends on your NBN connection, which in most cases depends on mains power. If the power goes out, your VoIP phone stops working. This is an important consideration for businesses that need to remain reachable during power outages. Options include call forwarding to a mobile number (most VoIP providers support this), a 4G router with battery backup, or keeping a mobile phone as a fallback. This is a known limitation of all NBN-based phone services, not just cheap plans.