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Browse destinationsThe rules, side by side
Checked 1 September 2026. Every rule below comes from the carrier’s own published terms.
| Carrier | When the clock starts | When it ends |
|---|---|---|
| Optus Daily Roaming | First use overseas, auto-activated | A rolling 24 hours from that moment |
| Telstra Day Pass, Upfront plans | First use in an eligible destination | 24 hours later |
| Telstra Day Pass, other plans | First use in an eligible destination | 11:59pm AEST, whatever time it is where you are |
| ALDI Mobile roaming packs | The moment you buy the pack | 7 days later, at midnight AET |
| Everyday Mobile add-ons | Activates immediately, but billed days start the day after purchase | 7 days from then |
| Vodafone $5 Roaming | Triggered when you use data, or make or receive a call, or send an SMS | 24 hours later |
| Belong travel pack | First connection to an eligible network in an included destination | 15 consecutive days later; you have 365 days from purchase to activate it |
| Coles Mobile roaming credit | When you buy the credit | 30 days after purchase; not a daily pass |
Why the Australian-time rule costs you
This is the one worth understanding, because it is invisible until it bites.
If your roaming day ends at 11:59pm Australian Eastern Standard Time, it ends at that moment wherever you are.
Land in London and start using your phone at 9am local. In Sydney it is already 6pm. Your day ends at 11:59pm Sydney time, which is 2:59pm in London. You have paid for a day and used about six hours of it. Start using your phone again at 4pm London time and that is a second day, at a second charge.
The same shape applies to ALDI’s packs, where a seven day pack bought on a Monday morning in Sydney expires at midnight Sydney time the following Monday. If you fly out Monday night, you spent the first day of a seven day pack at home.
Optus does not do this, and their support pages are explicit that the 24 hours runs from the moment the charge is triggered. There is no timezone in their rule because the rule does not need one. That is the better design and we have said so before, in how Optus daily roaming switches itself on.
The other trap: buying before you fly
ALDI’s packs start the moment you buy them. Their terms state packs “start as soon as you buy them and last for 7 days, expiring at midnight Australian Eastern Time (AET).”
So buying the pack the night before a morning flight to Europe costs you a day, and if the flight is long, close to two. The sensible move on ALDI is to buy the pack after you land, which requires either wifi at the airport or an already-working connection.
Everyday Mobile handles a night-before purchase generously. Their terms state the add-on “will be activated immediately” but that “your billed number of days will start the day after you purchase”. Buy it the night before you fly and you lose nothing.
Telstra and Optus both start on first use overseas, which sidesteps the problem entirely. Telstra does require you to activate the Day Pass in My Telstra before you travel, and notes it “can take up to 2 hours to activate”, so leave time.
Vodafone also runs for 24 hours from the eligible use that triggers it. Belong goes further for advance buyers: you have 365 days to use the pack, then its 15 day clock starts when you first connect to an eligible overseas network. Coles Mobile is the opposite shape, because its roaming credit expires 30 days after purchase whether or not you have travelled yet.
The full terms for both MVNOs, including their pack prices and destination lists, are in ALDI Mobile roaming packs vs a travel eSIM and Everyday Mobile roaming vs a travel eSIM.
What happens when the pack runs out early
Separate from the clock, and it catches different people.
ALDI and Everyday Mobile both forfeit unused data if you buy a replacement. On ALDI, buying the same pack type while one is active replaces it and unused inclusions are forfeited. On Everyday Mobile, “any remaining data will be forfeited upon activation of a new Add-on”, and their own guidance is to let the first expire before buying the next.
ALDI also caps you at two data packs per calendar day.
Optus does the opposite and adds another charge automatically. Their pages state that if you use the data in under 24 hours, another $5 charge is added and you get another 5GB, and this repeats. Convenient if you want it, expensive if you do not, and we could not find a published cap on how many times it can happen.
Which design suits which trip
| Your situation | The rule that helps |
|---|---|
| Short trip, want zero setup | Optus, rolling 24 hours from first use |
| Buying before you fly | Everyday Mobile, billed from the next day |
| Buying well ahead of the trip | Belong, with 365 days to activate |
| Long-haul flight before you arrive | Anything that starts on first use, so Telstra, Optus or Vodafone |
| Travelling west, so your local day runs late | Avoid the 11:59pm AEST rule |
| A trip longer than a week | Belong’s 15 day pack, Coles credit or a longer-validity alternative |
What a travel eSIM does instead
Worth saying plainly, because it is the reason we wrote this.
Our plans start on first connection to a supported local network at the destination, and run for their full validity from that moment. A 30 day plan is 30 days from when you land, not 30 days from when you paid, and not until 11:59pm on some Australian evening.
That means you can buy before you travel, keep the setup email handy, then install after landing on working airport wifi. If that is unavailable, use hotel wifi or another steady, trusted connection. No clock is running while you are in the air.
It also means we do not sell you a second day when your first one ends at an awkward hour, because there are no days. There is an amount of data and a validity window.
What we do not do is carry calls and texts on your Australian number. That is what the carrier products above are for, and it is a real reason to keep your Australian SIM in the phone alongside an eSIM rather than instead of one.
The setup that avoids all of this
Keep your Australian SIM in the phone with data roaming switched off. Calls and texts to your number still arrive. No roaming clock starts, because nothing triggers it.
Run a travel eSIM as the data line. It starts when you land and runs on its own validity.
Full walkthrough in keeping your Australian number with a travel eSIM, and the carrier-by-carrier detail sits in Australian MVNO roaming packs compared and Telstra vs Optus vs Vodafone international roaming.
Questions people actually ask
Does my Telstra Day Pass end at midnight local time?
It depends on your plan. On Upfront plans it runs 24 hours from first use. On other plans it ends at 11:59pm AEST, which is Australian time regardless of where you are.
If I buy an ALDI roaming pack before I fly, am I wasting a day?
Yes, potentially. ALDI packs start the moment you buy them and expire at midnight Australian Eastern Time seven days later. Buying after you land avoids it, if you can get online to do so.
Which carrier has the fairest roaming clock?
For a daily product, Optus, Telstra Upfront and Vodafone all use a rolling 24 hours from eligible use, with no timezone involved. Belong is also strong for advance purchase because its 15 day clock waits for the first eligible network connection.
How long does Vodafone’s $5 Roaming day last?
Twenty-four hours from the eligible use that triggers it. If use continues after that, another A$5 period begins.
When does a Belong travel pack start?
When you first connect to an eligible network in an included destination. You have 365 days from purchase to activate it, then it runs for 15 consecutive days.
When does Coles Mobile roaming credit expire?
Thirty days after purchase. It is roaming credit rather than a daily pass, so its clock is tied to when you buy it.
What happens if I use all my data on day one?
On ALDI and Everyday Mobile, buying a replacement forfeits anything left on the current pack, so timing matters. On Optus, another charge is added automatically and you get more data.
Do these rules apply to prepaid and postpaid the same way?
Not necessarily. Telstra’s Day Pass expiry differs between Upfront and other plans, which is a difference inside one carrier. Check your own plan type rather than the general page.
When does a travel eSIM start?
Ours start on first connection to a supported local network at the destination, so the validity runs from arrival rather than from purchase.
Can I avoid roaming charges completely?
Turn data roaming off on your Australian line and use a travel eSIM for data. Your Australian number still receives calls and texts, and nothing triggers a roaming charge on the carrier side.
Sources
Telstra Day Pass zones, pricing, activation requirement, the two hour activation note, the 24 hour and 11:59pm AEST expiry rules and pay-as-you-go rates from Telstra’s international roaming page, checked 1 September 2026. Optus Daily Roaming auto-activation, the rolling 24 hours, the repeat charge behaviour and trigger conditions from Optus’s own international roaming and Daily Roaming support pages, with full detail and quotes in how Optus daily roaming switches itself on. ALDI Mobile pack start and midnight AET expiry, the forfeit-on-repurchase rule and the two packs per day limit from their roaming packs page, checked 1 September 2026. Everyday Mobile immediate activation, day-after billing start and forfeit rule from their international roaming page, checked 1 September 2026. Vodafone trigger conditions from Vodafone’s international roaming page and the 24 hour validity from Vodafone’s in-flight roaming support page, checked 1 September 2026. Belong’s A$30 pack, 365 day use-by window, first-network activation and 15 consecutive day validity from its travel pack page and international roaming help, checked 1 September 2026. Coles Mobile’s default roaming availability and 30 day roaming-credit validity from its international roaming FAQ, checked 1 September 2026. Terms change without notice.
Written by Lachlan, who runs The SIM Shop from Brisbane and answers the support email himself.
