SIM only is a type of mobile plan where you pay for calls, texts and data. The SIM usually comes included with the plan and you don't get a phone with the SIM, which is why it's known as "SIM only" or a BYO phone plan.
A SIM only plan can traditionally be categorised as one of 2 types: prepaid or postpaid.
The main difference between them is when you pay for your mobile plan. With prepaid, you'll pay upfront at the start of the month before you start using your plan, whereas on postpaid it's normally at the end of the month.
In some instances, providers such as Telstra will make you pay at the start of the month even on a postpaid plan so keep an eye out for this to avoid any surprises.
In Australia, it's still common to get a SIM card with your mobile plan. You will usually need to buy a SIM card from the store or order it online. The SIM will then need to be inserted into your phone so you can activate your plan.
An eSIM allows you to set up your mobile plan digitally without the need of a physical SIM card, meaning you don't have to wait for your SIM to arrive by post. This can be especially useful when you're travelling overseas.
Some of the cheapest SIM only plans on Finder come from providers such as E.Tel, Flip, ALDImobile, CMobile, Lebara and Catch Connect.
However, the cheapest option won't always mean you're going to get the best value for your money. Plans might cost less but do they offer enough data and features to match your requirements?
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There's no one size fits all when it comes to choosing a SIM only plan. However, some of our top picks should be able to give you a leg up on your research.
There are a few features to look out for when choosing a SIM only plan to help you differentiate them all. Just keep in mind that if you're not in need of any of the following features, keep it simple and get a well-priced plan with just calls, texts and data.
At the time of writing, there are 32 providers offering 5G plans on Finder and a further 5 providers offering plans with a free 5G trial.
You can get an unlimited data SIM only plan, with prices starting at just $10 a month. However, you'll need to understand that unlimited data mobile plans come with a couple of caveats.
In Australia, most plans with unlimited data actually come with a monthly data allowance (anywhere between 2GB and 600GB), but they're considered unlimited because you won't get charged for going over this allowance.
Instead, providers will reduce your downloads speeds to around 1.5–2Mbps once you've used up your data allowance for the month.
This means you won't ever be hit with excess data charges but you'll have to put up with slow speeds until your plan renews the next month.
The only provider that gives you the option to use your exact SIM only plan overseas in 100+ countries is Vodafone. You'll need to enable international roaming for $5 a day to do so.
Here's a rundown of the pros and cons of signing up to a SIM only plan so you can decide if it's right for you:
There are 3 network providers in Australia – Telstra, Optus and Vodafone. They allow smaller providers also known as mobile virtual network operators (MVNOs) to access their network in order to sell SIM only plans.
MVNOs that run on the Optus and Vodafone network have full access to their coverage. For Telstra it's slightly different.
The majority of Telstra MVNOs run on its wholesale network that reaches 98.8% of the Aussie population. Only Boost Mobile has access to full Telstra coverage which reaches 99.5% of the population.
SIM only plans from Telstra start at $62 a month for 50GB. You also get:
Optus has the second largest network in Australia. Its SIM only plans start at $49 a month for 30GB and come with:
Vodafone's SIM only plans start at $49 a month for 100GB. It offers the least amount of coverage out of the big 3 but is the cheapest of the lot. You also get: