Optus Flex Plus is the name of Optus’s prepaid mobile plan. There is no lock-in contract: you pick a recharge amount, you get calls, texts and data for a set period, and when it runs out you simply recharge again. If you are thinking about switching to it, or you were moved onto it when Optus retired its older prepaid plans, here is what it costs, what you get, and how the parts people get confused about — AutoRecharge, data rollover and unlimited data weekends — actually work.
Quick answer
Flex Plus is a prepaid plan, so the minimum cost is just the recharge you choose. Current recharge options start at $15 for 6GB over 7 days, with 28-day options from $40 to $64, and long-expiry options at $200 for 186 days and $395 for 365 days. New customers get much more data on their first three recharges — for example, the $44 plan gives 110GB on each of the first three recharges, then 35GB ongoing. Every recharge includes unlimited standard national calls and texts. You manage everything in the My Optus app, and you can stop at any time simply by turning off AutoRecharge and not recharging again. Prices do change from time to time, so check the current details on the official Optus site before you buy: Optus prepaid plans.
What is Optus Flex Plus?
Flex Plus is Optus’s prepaid mobile service. It runs on the Optus 4G and 5G network, and you need a compatible phone and either a physical SIM or an eSIM. Because it is prepaid, there is no monthly bill and no contract term. You pay upfront for a recharge, use your inclusions until the expiry date, and then recharge again if you want to keep going.
It is also the plan Optus moved customers onto when it retired a number of older prepaid plans in August 2026, so if your old Optus prepaid plan disappeared, Flex Plus is most likely what replaced it.
Current recharge options and prices
These prices were confirmed on Optus’s own prepaid pages in October 2026. The headline figures for the first three recharges are much higher than the ongoing allowance, so the table shows both — judge the plan on the ongoing figure, because that is what you will live with long term.
| Recharge | First 3 recharges | Ongoing data | Expiry |
|---|---|---|---|
| $15 | 6GB (11GB with AutoRecharge) | 6GB | 7 days |
| $40* | 100GB | 30GB | 28 days |
| $44 | 110GB | 35GB | 28 days |
| $50* | 120GB | 40GB | 28 days |
| $54 | 130GB | 45GB | 28 days |
| $64 | 150GB | 55GB | 28 days |
| $200 | 180GB | 100GB | 186 days |
| $395 | 350GB | 240GB | 365 days |
*The $40 and $50 plans are AutoRecharge-only, and they come with an introductory price for the first 28 days — $13 for the $40 plan and $17 for the $50 plan — before moving to the full price. They also include a small eGift Card with every AutoRecharge recharge ($5 on the $40 plan, $10 on the $50 plan). The $200 plan adds 20GB of bonus data with AutoRecharge every recharge, and the $395 plan adds 40GB.
Every recharge includes unlimited standard national calls and texts — that covers calls to mobiles and landlines, 13 and 1300 numbers, and voicemail. Recharges of $35 or more also include international call minutes to selected countries, with the amount depending on the plan: the 365-day plan includes the most (6,000 minutes to Zone 1 countries and 800 minutes to Zone 2 countries). All inclusions are for use in Australia; roaming and premium numbers are not included and need an add-on or extra credit.
How AutoRecharge works
AutoRecharge is optional, but it unlocks a couple of perks, and some recharge options require it. When it is turned on, Optus takes the recharge amount from your saved card or bank details on the day your recharge expires (any time from 5:30am Sydney time), and your service recharges between 11pm and 11:30pm that same day. It can also trigger early if your data balance falls to 200MB.
If you change your mind after being charged, cancelling AutoRecharge before midnight on the expiry day means the payment is refunded within 2 to 10 business days, depending on your payment method. You can turn AutoRecharge on or off in the My Optus app, by calling 555, or by texting “Menu” to 9999 if you have a saved payment method.
Data rollover: what carries over and what does not
Unused included data rolls over, up to a maximum of 200GB, as long as you recharge before your current recharge expires or you keep an active AutoRecharge. That makes Flex Plus a good fit if your usage varies month to month — a quiet month is not wasted.
But there is a catch worth knowing: if you recharge before expiry, any unused days and any inclusions that are not eligible for rollover are lost. So rollover saves your leftover data, not leftover time.
Unlimited data weekends
On any 28-day Flex Plus plan with an active AutoRecharge, you get unlimited data with no speed caps each weekend, from 12:01am Saturday to 11:59pm Sunday local time. Normal speed caps apply on weekdays. The weekend data only works while your SIM is in a mobile phone, and it is not available on expired or manually recharged services — so if you recharge by hand instead of AutoRecharge, you miss out on this perk.
Bonus data on your first three recharges
New services get much more data on their first three recharges — for example, 110GB instead of 35GB on the $44 plan, and 350GB instead of 240GB on the $395 plan. To qualify, those first three recharges must happen within 90 days of activation for 28-day or shorter plans, or within 3 years of activation for the 186-day and 365-day plans. The bonus does not apply to rate-plan changes or SIM swaps, and after the third recharge your data goes back to the standard allowance. If you are comparing plans, compare the ongoing data — not the boosted first-three-recharge figures — because that is what you will live with long term. AutoRecharge customers also get ongoing bonus data on some plans: 5GB every recharge on the $15 plan, 20GB on the $200 plan and 40GB on the $395 plan.
Add-ons you can buy during a recharge
- $6 Unlimited Data Day: unlimited data at uncapped speeds for a day from activation.
- $5 International Talk: up to 300 minutes of standard calls to 50 selected destinations for 28 days.
- $10 MyData: an extra 5GB of data for 5 days.
- $10 Extras Credit: credit for international calls, messages, roaming and selected premium SMS services for 14 days.
- Roaming add-ons: $5 for 1 day (1GB, 100 texts, 100 minutes in Zone 1 destinations) or $35 for 7 days (7GB, 700 texts, 700 minutes).
You need an active recharge to buy an add-on. Standard recharges do not include roaming, international MMS, video calls or premium and special numbers — those need an add-on or extra credit.
How to join Optus Flex Plus
- Order a SIM or eSIM from Optus. A physical SIM can cost an extra $2; an eSIM needs a compatible phone and the latest version of the My Optus app.
- Activate it. A physical SIM must be activated within 30 days of purchase, and an eSIM service usually activates within a few hours of ordering.
- Pick your recharge amount and turn AutoRecharge on if you want the rollover and weekend-data perks.
- Manage the plan in the My Optus app — check your balance, change your recharge amount, buy add-ons, or turn AutoRecharge off.
How to change or stop your plan
To change your recharge amount, pick a different amount at your next recharge in the My Optus app. To stop, turn off AutoRecharge and simply do not recharge again — as a prepaid service, it expires on its own and there is no cancellation fee to pay. If you are moving to another provider, do not cancel first: porting your number to the new provider automatically ends your Optus service, and cancelling beforehand can risk losing your number.
Is Flex Plus worth it?
Flex Plus suits people who want the Optus network without a contract, and who like the safety net of data rollover. The 28-day plans are the sweet spot for most users — the $44 plan covers light to moderate use on its ongoing 35GB, while the $64 plan suits heavier streaming and hotspot use. The long-expiry plans make sense if you barely use mobile data but want to keep a number active for months at a time, since $200 over 186 days works out cheaper per month than any 28-day recharge.
It is less appealing if you need guaranteed uncapped speeds all week, if you travel overseas often (roaming is an add-on, not included), or if you want a handset included — Flex Plus is a SIM-only prepaid plan, so you bring your own phone. And remember the headline data on a new service includes first-three-recharge bonus data, so judge the plan on its ongoing allowance.
Frequently asked questions
Is Optus Flex Plus a contract?
No. It is prepaid, so there is no contract term. You pay per recharge and you can stop by not recharging.
Does unused data roll over?
Yes, up to 200GB, as long as you recharge before expiry or keep AutoRecharge active.
What happens if I turn off AutoRecharge?
Your service keeps working until your current recharge expires, then it stops unless you recharge manually. Note that some recharge options require AutoRecharge, and turning it off can mean losing the unlimited data weekend perk.
Can I keep my number if I leave Optus?
Yes. Port your number to your new provider and the move automatically ends your Optus service. Do not cancel your Optus service first.
Does Flex Plus include 5G?
Yes, on the Optus 4G and 5G network with a compatible device, but 5G is only available in selected areas and not in the Northern Territory. Optus says its network covers 98.5% of the population — check coverage for your address before signing up.
