🥇 4 Best SIM Only Plans for April 2021 | Finder

Best SIM only plans for April 2021

Maximise the value of your money with the best SIM-only mobile plans.

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Best SIM only plans for April 2021

Why trust our picks?


Mobile plans compared


Mobile providers


Expert picks

Our tech expert Alex Kidman spends time each month going through the hundreds of plans available in our Mobile Plan Finder™ to find the best deals in the market. With over 20 years of experience writing for a multitude of tech websites, you can trust that he knows what he's talking about.

Keep in mind: Our best picks might not always be the best for you. Always compare your options and choose the one that best suits your needs.

How did we choose the best SIM only plans?

Every month, we look at all the SIM only mobile plans available in our Mobile Plan Finder™ and find ones that we think are best suited for you across a number of categories. None of these best picks are sponsored, which means we also take into account mobile providers and plans we aren't partnered with. We level the playing field and make sure our choices for the best plans are done so without any bias.

We take these factors into account when choosing our monthly winners:

  • Price per month (and whether promotional pricing is involved)
  • Monthly data allowance (and if these are reliant on limited-time bonus data offers)
  • Plan length
  • Other notable features such as data banking, network coverage and international inclusions

Best value SIM only plan (+ 3 alternatives)

Circles.Life 100GB for $38 SIM-only Plan

SIM-only - Postpaid

There's no change with our winner for April, with Circles.Life's 100GB plan the easy recommendation for anyone looking for top value. You've got until April 30 to sign up to this plan for just $30 a month.

Circles.Life dominates the value space with its incredible 100GB deal and 12 month discount offer.

  • 100GB per month
  • Unlimited calls & texts
    Optus network
  • $30 per month
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Why we chose it:

  • 100GB of data is amazing at this price
  • 3GB effective bonus data means it's really 103GB
  • Full 12 month discount for new customers

Once again, Circles.Life takes the top award for SIM-only value with its 100GB plan. It's actually a 103GB plan because of the extra 3GB of "bill shock" data on top, plus unlimited calls and texts on a month by month basis. That alone makes Circles.Life a contender, but it's not done yet, offering a 20% per month discount for a full 12 months on the plan, so it only costs you $30 per month.

Best cheap SIM only plan (+ 3 alternatives)

Moose 23.80 20GB 1 Month

SIM-only - Postpaid

A 12 month discount and 20GB of data make Moose's budget SIM-only deal a real contender.

Moose operates on Optus's 4G network and offers unlimited calls and texts for a pleasantly low price.

  • 20GB per month
  • Unlimited calls & texts
    Optus network
  • $19.80 per month
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Why we chose it:

  • 20GB of data
  • 12 month discount
  • Unlimited calls and texts

When you get down into the weeds of really cheap SIM-only plans, it can be hard to ferret out a great deal. Moose Mobile's $23.80 plan usually wouldn't apply as a "cheap" plan since we tend to look at plans under $20 a month for this category, but you can now get it for $19.80 per month for a full year without price rises.

Best big data SIM only plan (+ 3 alternatives)

Circles.Life 100GB for $38 SIM-only Plan

SIM-only - Postpaid

No surprises here as Circles.Life continues to dominate the big data space with its 100GB plan at that low $30 price point. You get this deal for a full year as long as you sign up by April 30. You even get 3GB of 'bill shock' data protection, so it's actually a 103GB plan.

If you want data, and plenty of it, Circles.Life is the best option by a very wide margin.

  • 100GB per month
  • Unlimited calls & texts
    Optus network
  • $30 per month
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Why we chose it:

  • 100GB of data at a great price
  • 3GB of bill shock bonus data
  • A full year's discount for new customers

Again, we've got to roll out the awards podium with Circles.Life's name seemingly permanently etched upon it, because it's such a standout deal, with $30 per month for a full year scoring you 103GB of data plus unlimited standard national calls and texts on the Optus 4G network. You've even got the full month to sign up, as the current deal doesn't expire until the 30th of April.

Best SIM plan for international calls (+ 3 alternatives)

Extra Large Optus Choice Plan $79

SIM-only - Postpaid

With hefty calling inclusions and endless data, Optus' Extra Large Plan has lots of appeal for international call customers. It'll do you well to double check on Optus's website to see if the countries you want to call are one of the 35 destinations it covers.

As with all Optus plans, you'll also get Optus Sport included.

  • 120GB per month
  • Unlimited calls & texts
    Optus network
  • $79 per month
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Why we chose it:

  • UUnlimited calls to 35 destinations + 4GB roaming data
  • Optus Sport included
  • 120GB of full speed data plus endless data if you manage to go over quota

International call plan value rests largely on coverage in the countries you most want to call, so there's always some variability here. Optus once again impresses with its Extra Large plan, which provides unlimited calls to 35 international destinations, data sharing to other Optus accounts, 120GB of data with no excess usage charges if you use it all up, plus an Optus Sport subscription to boot. You also get 4GB of roaming data if you are one of the very few Australians to be travelling internationally right now.

How to find the right plan

If you're happy with your handset, a SIM only plan can save you a lot of money, as long as you compare the right details to ensure the best possible value. Here's what you should consider:

Calls and texts on your network

You can get unlimited standard local and national calls and texts for very little money these days, so if you're just a chatter and texter, don't pay more than you have to.

MVNOs are fighting over data

Make sure you get a plan with enough data to avoid paying extra charges.

5G isn't cheap (yet)

If you're keen on the next big thing in mobile, and are in the right spot, you've only got a few options.

Don't be afraid to switch!

SIM only plans are only getting better value over time and switching is a quick process.

Do I need any international inclusions?

Consider whether you need a plan with international calls and text included.

Frequently asked questions about SIM only plans

Which SIM only plan is best?

This depends on your mobile needs, but this month, we've named Circles.Life's 200GB plan as our best overall value pick.

Can I keep my old phone number with a SIM only plan?

Yes! All mobile providers are legally required to port your current number over to your new service. To find out how to do this, see our guide to number porting.

Is SIM only cheaper than a phone plan?

SIM only plans aren't inherently cheaper, since you'll be paying about the same for your phone whether you buy it outright or on a contract. The main benefit comes from finding a competitive monthly plan, rather than being locked into an expensive one.

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