Australia’s Best SIM Only Plans: Compare Data & Cost

Australia’s best SIM-only mobile plan depends on your data usage and coverage needs, but the cheapest unlimited-data plans start around $30–$40 per month from smaller carriers that use the Telstra, Optus, or Vodafone networks. This article compares data allowances, coverage, and costs across major and budget providers, helping you choose a plan that fits your budget without sacrificing signal where you live, work, and travel.

Formula

The calculator above works out two simple value metrics for any SIM-only plan: cost per gigabyte and data per dollar. The formulas are:

• Cost per GB = Monthly price ÷ Monthly data allowance (in AUD/GB)
• Data per dollar = Monthly data allowance ÷ Monthly price (in GB/AUD)

Where Monthly price is the plan cost in Australian dollars (AUD) and Monthly data allowance is the included data in gigabytes (GB). Lower cost per GB means better value for heavy users; higher data per dollar means you get more data for each dollar spent.

Worked Example

Using the default values from the calculator: a monthly budget of $40 and a data need of 20 GB.

1. Cost per GB = $40 ÷ 20 GB = $2.00 per GB
2. Data per dollar = 20 GB ÷ $40 = 0.50 GB per dollar

So with a $40 budget, you’re paying $2.00 for each gigabyte, and each dollar buys half a gigabyte. Use these numbers to compare plans side-by-side: a plan with a lower cost per GB is better if you consistently use most of your data, while a plan with higher data per dollar gives more data for the same money.

Why SIM-Only Plans Are Popular in Australia

SIM-only plans (also called prepaid or postpaid without a handset) have grown in popularity because they separate the cost of the phone from the cost of the service. In Australia, most people already own a smartphone, so paying $60–$100 per month for a handset plan often means you’re paying for a new phone you may not need. SIM-only plans typically cost between $10 and $60 per month, and they include the same national coverage, 5G access, and data speeds as contract plans—just without the device subsidy.

The Australian market is dominated by three physical networks: Telstra, Optus, and Vodafone. Many smaller providers (MVNOs) resell access to these networks at lower prices. For example, Boost Mobile and Belong use the Telstra network, while amaysim and iiNet use Optus, and Lebara and Kogan Mobile use Vodafone. This means you can often get a cheaper plan on the same network you already use, with similar coverage.

How Coverage Differs Between Networks

Coverage is the most important factor for many Australians, especially those in regional or remote areas. Telstra has the largest 4G and 5G footprint, covering about 99% of the population and the most extensive rural and outback coverage. Optus covers roughly 98.5% of the population, with strong metro and regional coverage but some gaps in remote areas. Vodafone covers about 96% of the population, concentrated in cities and major highways; it’s less reliable in rural and remote regions.

However, not all plans on a network offer the same coverage. Some MVNOs, like Belong (Telstra) and amaysim (Optus), use the full national network, while others, like Woolworths Mobile (Telstra) and some budget brands, may have reduced coverage in regional areas. Always check the provider’s coverage map before buying, especially if you travel outside metro areas.

Comparing Data Allowances and Costs

SIM-only plans in Australia range from small data allowances (1–5 GB) for light users to unlimited data plans for heavy streamers. As of 2024, typical pricing is:

• Budget plans (1–10 GB): $10–$25 per month. These suit light users who mostly use Wi-Fi.
• Mid-range plans (20–50 GB): $25–$45 per month. These are the most popular, offering enough data for streaming, social media, and work.
• High-data plans (100 GB+ or unlimited): $45–$60 per month. These suit heavy users, families, or those who tether.

Unlimited data plans are available from several providers, but they often have a “fair use� policy that reduces speeds after a certain threshold (e.g., 50 GB or 100 GB). For example, a $35 unlimited plan from a budget provider might slow to 1.5 Mbps after 50 GB, which is still enough for standard-definition streaming but not for 4K video.

How to Choose the Right Plan

To pick the best plan, follow these steps:

1. Check your typical data usage – Look at your phone’s data usage over the last few months. If you consistently use less than 10 GB, don’t pay for 50 GB.
2. Verify coverage in your area – Use the provider’s coverage map or a third-party site like OpenSignal to see signal strength at your home, work, and regular travel routes.
3. Compare cost per GB – Use the calculator above to compare plans with similar data allowances. A plan with a lower cost per GB is better value if you use most of your data.
4. Check for extras – Some plans include international calling, data rollover, or free access to streaming services. These can add value even if the price is slightly higher.
5. Read the fair-use policy – For unlimited plans, know the speed reduction threshold and how it affects your usage.

Common Mistakes and Misconceptions

One common mistake is assuming that all plans on the same network have identical coverage. As mentioned, some MVNOs have reduced coverage, so always check the specific provider’s map. Another mistake is ignoring the difference between 4G and 5G. While 5G is faster, it’s not available everywhere, and many budget plans still use 4G only. If you have a 5G phone and live in a 5G area, paying extra for a 5G plan might be worth it, but if you’re in a regional area, you won’t notice the difference.

Another misconception is that unlimited data means unlimited speed. In Australia, “unlimited� plans almost always have a speed cap after a certain data threshold. Always read the fine print.

Frequently Asked Questions

Which network has the best coverage in Australia?

Telstra has the largest and most reliable coverage, especially in rural and remote areas. Optus is a close second, with excellent metro coverage. Vodafone is best for city users who rarely travel outside urban centres.

Are SIM-only plans cheaper than contract plans?

Yes, typically. SIM-only plans cost $10–$60 per month, while contract plans with a phone can cost $60–$100+ per month. Over a 24-month contract, you could save hundreds of dollars by buying a phone outright and using a SIM-only plan.

Can I keep my phone number when switching?

Yes, in Australia you can port your number to a new provider for free. The process usually takes a few hours to a day, and your old service continues until the port completes.

Do SIM-only plans include international calls?

Some do, but not all. Providers like Lebara and amaysim include international minutes to select countries, while others charge extra. Check the plan details if you make regular overseas calls.

What happens if I exceed my data limit?

Most postpaid SIM-only plans either charge you for extra data (usually $10 per GB) or automatically block data until the next billing cycle. Prepaid plans often simply stop data when the allowance runs out, so you won’t be charged extra.

Is 5G worth paying extra for?

Only if you have a 5G phone and live in a 5G coverage area. If you’re in a metro area, 5G can give you much faster speeds, but if you’re regional, it’s unlikely to make a difference.

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in t | Monthly budget | AUD | 40 | 0
in d | Data needed | GB | 20 | 0
out cost_per_gb | Cost per GB | AUD/GB | t / d | 2
out data_per_dollar | Data per dollar | GB/AUD | d / t | 2