Compare SIM-Only Mobile Plans in Australia (2026)

SIM-only mobile plans are still one of the clearest ways to cut phone costs in Australia if you already own a handset. The problem is that the current market is not just about raw data anymore. The strongest comparison now comes from matching your usage, your preferred network, your 5G needs, and the real price after any launch discount ends.

That matters even more if you are specifically searching for Optus SIM-only plans, Optus network providers, or an Optus vs Telstra or Vodafone comparison. Those are high-intent searches from people close to switching. They need current plan context, clear trade-offs, and a shortlist that separates major-network branding from lower-cost MVNO value.

Quick answer: how should you compare SIM-only mobile plans in Australia in 2026?

Start with your real monthly data use, then compare plans by network fit, 5G access, international features, and the full cost after any promotion ends. If Optus SIM-only plans are on your shortlist, compare them against similar Optus-network MVNOs as well as direct Telstra and Vodafone alternatives, because the best-value option is not always the major-brand plan.

Best Optus SIM Only Deals in Australia

As of 18 June 2026, Optus is selling several month-to-month Choice Plus plans plus promotional variants on the same SIM-only page. The live page shows a 60GB Choice Plus plan at $60 per month, an EOFY 60GB promo at $39 per month for the first 12 months then $60, a 240GB plan at $70, a 360GB promo at $69 for 12 months then $79, and a 480GB plan at $90. Optus also advertises a tertiary student offer with 200GB for $39 per month for 12 months.

The commercial lesson is straightforward. Optus is competing with a mix of standard plans and promotional plans. The promotional offers can look very strong at sign-up, but the standard price in month seven or month thirteen often changes the value equation against amaysim, SpinTel, Belong or Vodafone.

What Optus gets right

• Optus keeps its SIM-only plans month to month, which lowers switching risk.
• The current range covers light, medium and very heavy data users.
• eSIM, roaming and international features are built into the direct-carrier experience.
• The promo plans create a stronger first-year value story than the standard Optus rack rates.

Where shoppers should be more sceptical

• The ongoing monthly rate is often materially higher than the promo rate.
• Large data inclusions can make Optus look better on paper than in real-world value per dollar.
• Lower-cost Optus-network providers may suit shoppers who care more about price than brand extras.
• Optus is strong for metro and suburban users, but regional shoppers should still compare against Telstra coverage.

Which Providers Use the Optus Network?

People searching for Optus network providers are usually asking a more practical question: can I get Optus-style coverage without paying full Optus prices? The answer is often yes, but the details matter. Some providers clearly market current 4G and 5G access. Others route you to Critical Information Summaries or coverage maps and need a closer check before you sign up.

The key takeaway is that not every provider people mention in Optus-network conversations is actually on Optus today, and not every Optus-backed provider gets the same speed treatment, international inclusions or promo structure. That is why the smartest comparison is not simply network logo versus network logo. It is direct Optus against the best current Optus-network value option that still matches your needs.

Optus vs Telstra SIM Only Plans

This is the comparison many Australians make when coverage confidence matters more than absolute lowest price. Telstra's current SIM-only page positions itself around national coverage, month-to-month flexibility, eSIM, data sharing and no excess charges. Optus positions itself around large data pools, strong promos, and direct-carrier extras such as roaming, eSIM and international talk on higher plans.

Who should choose Optus over Telstra

• Metro and suburban users who want bigger data inclusions for the dollar.
• Shoppers willing to use first-year promotional pricing strategically.
• Users who want a major carrier but do not need the most extensive regional footprint.

Who should choose Telstra over Optus

• Regional users, frequent travellers on highways, and people who treat coverage as the first filter.
• Users who want the most conservative network choice and are willing to pay more for it.
• Households already invested in Telstra's wider ecosystem, including data sharing and Telstra Plus.

Optus vs Vodafone SIM Only Plans

Optus vs Vodafone is a more price-sensitive comparison. Vodafone's live page on 18 June 2026 highlights 60GB, 200GB and 400GB SIM-only tiers with 50% off for the first 6 months, then standard pricing of $53, $63 and $73. Vodafone also leans on $5 roaming, a 30-day network satisfaction guarantee and metro-focused 5G messaging.

For metro users on a tight budget, Vodafone can be very hard to ignore when the half-price period is running. For users who want a stronger middle ground between price, brand scale and broader coverage confidence, Optus will often be the more balanced alternative.

Best MVNO SIM Only Plans

An MVNO is a mobile virtual network operator. That means the provider sells mobile services using access to a larger carrier network rather than building its own national mobile network from scratch. In Australia, that usually means a provider sells plans using the Telstra, Optus or Vodafone network footprint.

Why shoppers choose MVNOs

• Lower monthly prices than direct-carrier plans.
• Cleaner prepaid or month-to-month structures with fewer bundled extras.
• Useful niche features such as data banking, international-call inclusions, or greener brand positioning.

What to watch out for

• Speed caps can differ from the major-carrier retail plans.
• Not all MVNOs include the same roaming, call or customer-support options.
• Some providers use the same underlying network but do not match the full retail network experience.

Best eSIM Plans Australia

eSIM is a digital SIM profile built into a compatible phone, watch or tablet. Instead of inserting a plastic SIM card, you activate the service electronically. For SIM-only shoppers, that usually means faster activation, easier dual-SIM use, and a cleaner setup if you are moving between work and personal services or planning travel.

Dual-SIM flexibility is one of the biggest benefits. You can keep one number for work, one for personal use, or keep an Australian service active while adding a travel eSIM overseas. That makes eSIM especially useful for frequent travellers, people testing a new provider, and users who want to separate data or call patterns across two services.

If eSIM is a priority, check both device compatibility and transfer rules before switching. Some providers make new activations easy but handle replacements or cross-device moves differently.

How to compare SIM-only plans properly

1. Check your real monthly data use over at least the last three billing cycles.
2. Decide whether network fit or lowest monthly price is your first filter.
3. Compare the promo period and the ongoing price separately.
4. Confirm whether 5G is included, speed-capped, or only available in selected areas.
5. Check international calls, roaming and eSIM rules if they matter to you.
6. Read the current Critical Information Summary before you switch.
7. Choose the cheapest plan that still fits your usage, not the one with the biggest headline data number.

If you are comparing your broader communications budget, the next useful steps are our Compare NBN plans, our internet value calculator, our What is my IP address tool, and our best internet providers in Australia overview.

Common mistakes when comparing SIM-only plans

The biggest mistake is paying for more data than you realistically use. The second is comparing only the promotional price and not the standard rate that starts later. The third is assuming every provider on the same network gives the same overall experience. Speed caps, roaming, international inclusions, eSIM support and support models still vary materially from one provider to another.

Frequently asked questions

The questions below target the most common high-intent mobile-plan queries we see around Optus, MVNOs, eSIM, prepaid and major-network comparisons.

Sources and methodology

This update was reviewed against public provider pages and current plan or CIS material available on 18 June 2026, including the live Optus SIM-only page, Telstra SIM-only page, Vodafone SIM-only page, amaysim SIM plans page, SpinTel mobile plans page, Southern Phone SIM-only CIS, Belong mobile plans page, Moose Mobile coverage page, Dodo mobile plan and CIS pages, and Coles Mobile pricing pages. Where a provider site was unavailable or unclear, the guide states that explicitly rather than presenting unverified plan claims as fact.