Best cheap 365-day prepaid mobile plans in September 2025

Although a 365-day prepaid plan isn't going to be the best fit for every Aussie, it's definitely a good option for those who want and forget when it comes to their mobile plan. Even if you won't be able to save money in the short and medium-term by changing up your provider if you find a better deal, the long term savings may well be worth it for some consumers. 

In this guide, we're going to take a look at the best 365-day mobile plans, as well as cheaper options when it comes to 12-month prepaid plans and long-expiry mobile plans available in Australia.

If you're in the market for a top-value prepaid SIM with 365-days expiry, it's hard to look past the one above. This OnePass Mobile mobile plan comes with all the usual unlimited call and SMS trimmings (nationally), 200GB of data and 4G speeds on the Optus network. That works out to be the equivalent of 16.6GB of data per month. 

If you sign up before 30 September 2025, you'll pay just $149 rather than the usual $200 Recharges for this particularly 365 day SIM will revert the cost to the usual rate, but if you're after a solid amount of data and 365-day expiry this is a standout choice so far as yearly mobile plans go.

For a sense of your other options when it comes to 365 day mobile plans, check out the list of popular 365-day long term prepaid plans that cost $200 or less per year.

 At the time of writing, there are currently ten providers in our database who offer 365-day prepaid plans in Australia. That list includes Telstra, Vodafone, Optus, Kogan, Everyday Mobile, OnePass Mobile, Coles Mobile, Boost Mobile, LycaMobile and Amaysim. The provider with the cheapest 365-day prepaid plan in Australia varies from month to month.

If the pick above isn't quite what you're after then be sure to check out the widget below for a snapshot of the cheapest 365-day prepaid plans in Australia.

Long expiry prepaid plans are, by their very nature, relatively straightforward and no-fuss. That simplicity is a big reason that people opt for them. Still, there's a few things to keep an eye out for when choosing a 365 day prepaid phone plan:

• Longer recharge durations: There are a few different types of long expiry prepaid options. The most common is the 365-day recharge, but there are also 90-day and 180-day options. Every now and then, telcos will off one-year recharge options, which won't necessarily last you 365 days, instead they expire on a year from the day you activate.
• Better dollars-to-data value: The easiest way to compare long expiry prepaid options is to calculate the equivalent monthly cost and inclusions. This allows you to compare 180-day and 365-day recharge options in a like-for-like way. For example, Kogan's $150 Small Flex Plan costs $150 and gets you 140GB of data to use over the year. That works out at roughly $12.50 and 11.6GB of data per month. You could then compare that against the Catch Mobile 365 day plan that comes with 200GB of yearly data, which works out to be $16.60 and 16.6GB of data per month.
• Data rollover: Different telcos offer different data rollover offers (some don't offer it at all). Some allow you to bank a limited amount of unused data for your next recharge, others let you rollover all of your unused data if you recharge before the expiry date. It's important to know which data rollover or data banking option is available to you before signing up.
• Auto-recharge with no excess data fees: Again, different telcos have different ways of handling excess data charges. Some will simply charge a per-megabyte rate for all data used in excess of your inclusions, deducting that amount from the dollar value of your recharge amount. Others offer convenient auto-recharge options that automatically top-up your balance via direct debit when you run out of credit or your plan expires