The True Cost of Optus Daily Roaming in Europe (2026) vs. Lotsotravel eSIM

Fourteen days in Europe on Optus Daily Roaming costs a minimum of $70 AUD. The same fortnight on a Lotsotravel Europe+ eSIM runs about $17 USD, roughly $25 AUD. Optus isn't the worst deal in mobile roaming, in fact it's one of the more reasonable per-day rates we've priced against an eSIM, but it still costs Australians noticeably more than a dedicated travel eSIM once a trip runs past a few days.

Optus Daily Roaming charges $5 AUD for a rolling 24-hour window the moment your phone first touches data, a call, or an SMS on a Zone 1 network, which covers more than 40 European countries. That $5 buys 5GB of data plus unlimited standard talk and text for the window. Use less than 5GB and the leftover is forfeited when the window closes. Use more than 5GB and Optus automatically renews the pass for another $5 and another 5GB, repeating each time you run out within the window.

We re-price Daily Roaming against a Lotsotravel Europe+ eSIM whenever we refresh our itinerary comparisons, so the numbers below reflect real per-day arithmetic rather than a worst-case scare figure. The rest of this guide works through what five common European trips cost on each side, the billing mechanics that drive the totals, the dual-SIM setup that keeps your Optus number live while your data runs through the eSIM, and the specific situations where Optus is still the better call.

What the same trip costs each way

These are five European itineraries we see often in Lotsotravel order data from Australian customers. All Lotsotravel figures use the Europe+ regional plan, which covers 35 European countries on a single eSIM. AUD/USD conversions use a spot rate of approximately 0.69 USD per AUD.

Every row assumes each travel day stays under the 5GB included in a single Daily Roaming window, which covers the large majority of leisure travellers doing maps, messaging, social media, and normal photo uploads. The savings run from roughly 48% on a short Paris weekend to around 67% on a three-week multi-country trip, a meaningfully smaller gap than some carriers post, but the eSIM still wins on every itinerary length we tested, and the gap widens the longer the trip runs, since Optus bills one $5 charge per day with no discount for length while the Lotsotravel plan price is fixed regardless of how many days it covers.

Why the totals come out the way they do

Daily Roaming is not a separate travel data plan. It's a 24-hour pass that layers onto your existing Optus account the moment your phone touches a Zone 1 network. Three mechanics drive what you actually pay.

1. The window is rolling, not calendar-day. It starts the instant your phone first uses data, voice, or SMS abroad and runs for 24 hours from that point, not from midnight in any particular time zone. Land in Rome at 7am local and check email immediately, and your window runs until roughly 7am the next day.
2. Unused data is wiped when the window closes. A traveller who used 300MB of maps and messaging in a day paid the same $5 as one who streamed two hours of video, and neither gets credit carried into the next window.
3. Going over 5GB triggers an automatic renewal that repeats. Optus adds another $5 pass the instant the first 5GB runs out, and does it again each time a block runs out. A day of laptop hotspotting for work, or a family sharing one phone's connection across four devices, can turn a $5 day into $15 or $20 without any prompt asking you to confirm the extra charge first.

None of this makes Optus an outlier; most global carriers use some version of the same day-pass mechanic. What makes Optus specifically worth checking before you fly is the combination of a genuinely competitive $5/5GB headline rate with an auto-renewing top-up that repeats each time you run out, so a single heavy-data day can cost more than three light ones combined.

The two plans side by side

Coverage and the other Optus roaming options

Optus's Zone 1 list runs to more than 150 destinations worldwide and includes upward of 40 European countries: the United Kingdom, France, Germany, Italy, Spain, Portugal, the Netherlands, Switzerland, Austria, Ireland, and most of the rest of the continent Australians typically visit. Optus publishes the current, authoritative version of that list on its international roaming rate finder, since destination and zone assignments can change. Lotsotravel's Europe+ plan covers 35 countries on one eSIM, and the two lists overlap across essentially every mainstream leisure stop.

Daily Roaming isn't available on every Optus plan. It's limited to Choice Plus, Plus Family, and Plus Promo plans. Customers on other postpaid plans are instead billed the older Optus Roaming Pass at $10 AUD per day for a smaller 1GB allowance, roughly double the price per gigabyte of Daily Roaming. Optus also runs separate, more limited roaming options for Prepaid customers, which we don't model here since they apply to a minority of travellers and work differently from either postpaid product. If you're not certain which product applies to your line, check the roaming section of the My Optus app before departure, since the dollar figures in this guide assume the $5/5GB Daily Roaming rate.

The ACMA's International Mobile Roaming Standard requires Optus to notify you when you first start roaming and to send usage alerts at 50%, 85%, and 100% of an included value pack. Those alerts are built for traditional data packs and don't map cleanly onto a pay-as-you-go daily pass that auto-renews; in practice, the alert most travellers actually see is the one confirming a new $5 charge just went through, which is notification after the fact rather than a chance to stop it.

When Optus Daily Roaming is the better choice

Daily Roaming is a genuinely competitive product for what it is, and a few situations tilt back toward Optus over an eSIM.

• Very short trips of a day or two. A 24-hour Singapore stopover en route or a one-night dash into London costs a single $5 AUD charge, cheaper in absolute terms than most Lotsotravel Europe+ plans, since our smallest plans are priced for multi-day trips.
• You need your Optus number to keep working for calls and texts without any setup. Daily Roaming activates automatically the moment you land, no QR code, no settings changes, nothing to configure before you fly.
• No eSIM-compatible phone. Pre-2018 iPhones, older Android handsets, and most basic devices don't support eSIM. Daily Roaming, or the Roaming Pass on non-eligible plans, is the only carrier-native option in that case, short of buying a physical local SIM on arrival.
• You're not sure you're eligible for Daily Roaming and don't want to check. If your line falls back to the $10 AUD/1GB Roaming Pass, the case for switching to an eSIM gets stronger, not weaker, but if all you want is a working phone with zero pre-trip effort, Optus still delivers that.

For trips of three days or longer on an eSIM-compatible phone, the accumulating daily fee and the repeating auto-renewal on heavy-data days make the eSIM the cheaper and more predictable option.

Dual-SIM workflow for Optus customers in Europe

This setup keeps your Optus number reachable at eSIM data prices.

Step 1. Buy the Europe+ eSIM 3-7 days before you fly

Pick a plan size that matches your usage. Light users (maps, messaging, occasional photo uploads) typically need 3-5GB per week; heavy users running video calls, hotspot for a laptop, or social media with video want closer to 1-2GB per day. Lotsotravel emails a notification when your QR code is ready, then you access it through the website.

Step 2. Install the eSIM at home

On iPhone: Settings → Cellular → Add eSIM → scan QR code. On Android: Settings → SIMs (or Connections → SIM Manager) → Add eSIM → scan. Label the new line "Travel" so it's easy to tell apart from your Optus line.

Step 3. Configure which line handles what

• Cellular Data: Travel (the Lotsotravel eSIM)
• Default Voice Line: Optus
• iMessage / FaceTime: Optus
• Allow Cellular Data Switching: OFF, this is the setting that matters most. It stops iOS from quietly routing data back through Optus whenever the eSIM signal briefly weakens.

Step 4. Disable Data Roaming on the Optus line

Settings → Cellular → tap the Optus line → Data Roaming OFF. Voice and SMS keep working normally on Optus, including one-time passcodes from Australian banks and myGov; only the data path on that line is closed, which also means Daily Roaming never triggers.

Step 5. Activate on arrival

Turn on cellular data for the Travel line when you land. The eSIM attaches to a European partner network within 30-60 seconds. From that point, Optus won't bill a single roaming dollar.

What this comparison does not measure

The cost math above isolates one variable: data price per trip. A few things sit outside it on purpose.

Voice call quality is the first. Both Optus and Lotsotravel route through partner networks abroad, and actual call quality depends on the specific partner carrier, local tower density, and the handset, not on which SIM sent the call. Support responsiveness is the second gap: Optus support is phone-accessible from Australia in English, while Lotsotravel support runs through WhatsApp and email, typically under an hour for routine issues. Hotspot performance is the third: Daily Roaming's 5GB allowance can be used for tethering, but a heavy hotspot session is exactly the scenario most likely to trigger the auto-renewal we flagged earlier, while Lotsotravel hotspot speed depends on the local European partner network and can occasionally be throttled during peak local demand. None of this changes the underlying price comparison, but any of it could matter more than cost for a specific trip.

What to actually buy

Optus Daily Roaming in Europe in 2026 is one of the more reasonable per-day roaming rates we've priced, and for a quick one or two-day stop it can genuinely be the simpler, cheaper option. Past that point, the math shifts: $5 AUD compounding every single day of a trip, plus an auto-renewing top-up that repeats on heavy-data days, adds up to $70 AUD on a two-week European itinerary against roughly $25 AUD of equivalent Lotsotravel Europe+ coverage, and the gap only grows on longer trips.

For anything beyond a short stopover on an eSIM-compatible phone, install a Lotsotravel Europe+ eSIM, disable Data Roaming on the Optus line, and pay roughly half to two-thirds less for the same 35-country coverage with no risk of an auto-renewed charge on a heavy data day. The five-minute setup pays for itself well before your first week is out.