How do prepaid data only SIMs work?
Prepaid data only SIMs operate similarly to prepaid plans for your mobile phone, except that they only include data and no call minutes or texts. Therefore, they are usually used for mobile broadband devices like tablets, iPads, Pocket Wi-Fi modems, or laptops.
Select a provider that meets your requirements, order your prepaid data only SIM, and you will receive a SIM card to place in your chosen device. To use the mobile broadband service, you simply “recharge” the SIM card with one of the provider’s data plans. A prepaid data only SIM never has a lock-in contract, which means you can cancel the service and switch providers whenever you want without penalty.
What is the difference between a prepaid data only SIM and a postpaid mobile broadband plan?
The main difference is how you pay and the commitment involved. A prepaid data only SIM is not tied to a specific provider for a fixed period – you pay in advance for the data you need.
In contrast, a postpaid mobile broadband plan (often called a “data plan” or contract) generally involves a monthly bill. While many postpaid plans are now month-to-month, some still involve 12 or 24-month contracts, especially if a device like a portable modem is included.
With a prepaid data only SIM, it is easier to switch between different data allowances or providers as your needs change. Postpaid plans, however, generally offer larger data allowances (sometimes hundreds of gigabytes) which can be better for heavy users.
When is a prepaid data only SIM better than a postpaid plan?
Which option suits you best mainly depends on how you intend to use your mobile broadband and how much data you need.
A prepaid data only SIM is a more flexible option that is perfect for people who need internet occasionally – for example, for the holiday house, a camping trip, or a backup connection. It is also a good choice if you don’t use a lot of data, as you can often buy “Long Expiry” plans that last for 6 or 12 months.
If you plan to use your mobile internet every day and know that your data usage is high (e.g., for streaming video), a postpaid mobile broadband plan is likely to be a more cost-effective choice.
How to choose the best prepaid data only SIM
Choose a provider with good network coverage
For your data plan to work, the provider must have network coverage where you are located. Australia is vast, and coverage differs between the metro areas and regional/rural areas. Many providers use the Telstra, Optus, or Vodafone networks. Check the coverage maps on their websites to ensure they service your area before ordering.
Explore the range of data allowances
The data inclusions vary greatly between providers. If your usage changes from month to month, or if you want the flexibility to add more data instantly, look for a provider with a wide range of recharge options.
Some providers also offer Data Banking, which allows you to save your unused data for later use if you recharge before your plan expires.
Check the expiry period
This is a crucial factor for data SIMs. Unlike phone plans which usually expire in 28 or 30 days, many prepaid data only SIMs offer “Long Expiry” options. You can often buy a block of data that remains valid for 6 months or even 365 days. This is excellent if you only use the device sporadically.
Compare the prices
Data is the main cost factor. Prices vary between providers, so take the time to compare the “cost per GB”. We recommend you compare prices after you have selected a few providers that offer the coverage and expiry terms you need.
Where can you buy a prepaid data only SIM?
Usually, you can order the SIM card online directly from the provider’s website. You can also purchase them physically at supermarkets (like Coles or Woolworths), post offices (Australia Post), and electronics retailers (like Officeworks or JB Hi-Fi).
Which is the cheapest prepaid data only SIM?
Vodafone 9 GB is the cheapest prepaid data only SIM right now (checked on 22/10/26). Recharge from $13.00.
Do you need a router for a prepaid data only SIM?
You might need a router (often called a modem or Pocket Wi-Fi) if you want to share the connection with other users or multiple devices, or if your primary device does not have a SIM card slot.
If you are using the SIM directly in a tablet or laptop that is “cellular enabled” (has a SIM slot), you do not need a router.
Is a dongle needed for a prepaid data only SIM?
If your device, such as an older laptop or desktop computer, lacks a SIM card slot, you may need a USB dongle. You place the SIM card inside the dongle and plug it into the computer’s USB port.
However, these days, most people prefer a battery-powered “Pocket Wi-Fi” modem instead of a USB dongle, as it allows you to connect multiple devices (phones, tablets, and laptops) wirelessly at the same time.
Can you use prepaid data only SIMs abroad?
Using a prepaid data only SIM from Australia while overseas is often difficult or expensive. Unlike phone plans, many data-only plans do not have international roaming capabilities enabled by default.
Even if the provider allows roaming, the “Pay As You Go” rates for data can be extremely high. It is almost always cheaper to buy a local data SIM card in the country you are visiting, or to purchase a travel-specific eSIM for your trip. Always check the international roaming terms on your provider’s website before you travel.
Frequently asked questions about prepaid data only SIM
Yes, several Australian providers offer a prepaid data only SIM with 365 days expiry. These “set and forget” plans are perfect for tablets or backup modems. Typically, you pay an upfront fee for a large chunk of data, which you can then use at your own pace throughout the entire year without worrying about monthly resets. Many long-expiry plans in 2026 also include data banking, allowing you to roll over unused data if you recharge before the 365 days are up.
To find the cheapest options, you should compare the “cost per gigabyte” rather than just the upfront price. Many providers offer low-cost starter kits for a single month, but the best long-term value is often found in long-expiry plans. Keep an eye out for introductory offers for new customers, but always check what the recharge price will be once that initial period ends to ensure you are getting a sustainable deal on your prepaid data only SIM card.
While most Australian prepaid data only SIM plans are designed for domestic use, many major telcos offer international roaming add-ons. If you are heading to Europe, check if your provider has a “Daily Roaming” bolt-on. Keep in mind that roaming on a prepaid data SIM can be expensive; for extended trips to Europe, it is often more cost-effective to purchase a travel eSIM or a local SIM card upon arrival.
It depends on how consistently you use data. A month-to-month plan offers flexibility and is ideal if your data needs fluctuate or if you’re only in Australia for a short time. On the other hand, a long-expiry prepaid data only SIM is usually better value for money if you want a constant connection for a secondary device and want to avoid the hassle of recharging every 28 or 30 days expiry.
Absolutely. A prepaid data only SIM card is specifically designed for non-phone devices like iPads, tablets, and portable Wi-Fi dongles (hotspots), and many now offer full 5G connectivity to match Australia’s expanded network coverage.
