Most “Optus roaming vs eSIM” articles quote one number and move on. That misses the real story. Optus doesn’t price roaming as one flat rate. It splits the world into zones. Which zone your destination falls into decides whether you get a capped daily price at all, or fall straight into pay-per-MB rates that can wreck a weekend budget. This breakdown works zone by zone, using Optus’s own published rates, lined up against real eSIM pricing for the same countries.

Optus Actually Runs Two Different Zone Systems

Here’s something most comparison articles get wrong, or skip entirely. Optus uses two separate zone frameworks, and they don’t overlap.

The first is the modern data roaming system behind Daily Roaming, the Roaming Pass, and Prepaid Roaming Packs. It splits destinations into Zone 1 and Zone 2. This zone system decides whether you can buy a capped daily pass at all.

The second is the older AutoRoam voice and video call structure. It runs across five zones, not two. Optus’s own AutoRoam factsheet lists per-minute international call rates climbing from AU$1.40 in Zone 1 to AU$6.60 in Zone 5. This system prices calls and texts on a pay-per-use basis. It’s separate from the data zone that governs your roaming pass eligibility.

If you’ve seen conflicting “zone” numbers while researching Optus roaming, this is why. Same word, two systems, different destinations and different products.

Zone 1: Where Optus’s Capped Roaming Actually Works

Zone 1 is the good news zone. Depending on the product, it covers somewhere between 110 and 170 destinations. That includes popular routes like the UK, USA, Thailand, New Zealand, and most of Europe.

Three products apply here, and the one you get depends on your plan.

Choice Plus customers get Optus Daily Roaming: $5 per day for 5GB of data plus unlimited calls and texts. You’re only charged on days you actually use your phone. Skip a day and turn off data roaming, and Optus doesn’t bill you for it.

Other eligible postpaid customers get the $10 Optus Roaming Pass instead. That’s $10 per day for just 1GB, plus unlimited calls and texts. The same daily-use billing rule applies.

Prepaid Flex Plus customers get Prepaid Roaming Packs. A 1-day pack costs $5 for 1GB, 100 minutes, and 100 texts. A 7-day pack costs $35 for 7GB, 700 minutes, and 700 texts.

Here’s how that stacks up against a real eSIM price for the same region. BazTel’s Denmark eSIM runs on the TDC and 3 Denmark networks. A 10GB pack costs $10, valid for 30 days. A traveler on Optus Daily Roaming pays $5 a day regardless of how much of that 5GB they actually use. Over a 7-day trip, that’s $35 — for data most travelers won’t come close to using. The eSIM covers the same trip, with weeks of validity to spare, for $10

Zone 2: Where Optus Has No Safety Net at All

This is the part that trips travelers up hardest. Zone 2 typically covers destinations like Turkey, Mexico, South Africa, and India. None of Optus’s capped products apply here. Daily Roaming, the Roaming Pass, and Prepaid Roaming Packs are all Zone 1 only.

That leaves Standard Roaming rates as the only option. Roughly $1 per MB of data. $1.50 to $4 per minute for calls. $0.50 to $1 per text. Do the math on that data rate and it gets ugly fast. One gigabyte at $1/MB works out to roughly $1,024. A modest 200MB a day of maps and messaging over 10 days adds up to 2GB. That’s over $2,000 at standard rates.

Nobody actually pays that. In practice, travelers switch data roaming off entirely and go dark. They rely on hotel Wi-Fi and hope for the best. That’s a real cost too, just one that doesn’t show up on a phone bill.

BazTel covers Turkey in its 2026 trial pricing push. It offers $1 for a 1GB starter plan across popular routes, Turkey included, with larger data packs available for longer trips. For a Zone 2 destination, that’s not a discount over Optus. It’s the only sane option, because Optus doesn’t sell a bounded data product there at all.

Real Trip Math: Two Scenarios

Scenario A — 7 days in Denmark (Zone 1). Optus Daily Roaming: $35 for the week, assuming daily data use. Optus Roaming Pass on a non-Choice-Plus plan: up to $70 for the same week. BazTel’s 10GB, 30-day Denmark eSIM: $10 flat, full trip covered.

Scenario B — 10 days in Turkey (Zone 2). Optus Standard Roaming: no bounded price exists. Realistic light use runs into the hundreds or thousands of dollars, which is why almost nobody actually roams on data there. BazTel: eSIM data plans starting from $1 for 1GB, scaling up for longer stays.

The Zone 1 story is “eSIM is cheaper.” The Zone 2 story is closer to “eSIM is the only option that doesn’t mean avoiding your phone.”

What Optus Roaming Still Does Better

This isn’t a one-sided pitch. Optus keeps your Australian number live for calls and texts. That matters for bank one-time passcodes, appointment reminders, and anyone trying to reach you on your usual number. Bundled unlimited calls and texts on the $5 Daily Roaming pass are genuinely useful if you’re fielding calls from home.

For a one or two-day trip, the setup friction of a new eSIM might not be worth it either. Daily Roaming just works the moment you land, provided your destination sits in Zone 1.

The Hybrid Approach

Most frequent travelers land on a mix. Keep the Optus SIM active for calls, texts, and verification codes. Turn off data roaming in your phone settings before you fly. Run your actual data — maps, messaging, social media, streaming — through a destination eSIM instead.

Our guide to using eSIM plans for international travel walks through setup. Our Europe eSIM guide covers regional plans if you’re crossing borders on one trip.

For country-specific pricing, see our breakdowns for Denmark, Netherlands, and Czech Republic. For Zone 2 pricing, browse the eSIM for India plan page.

FAQ

Does Optus charge me if I don’t use data overseas?

No. Daily Roaming and the Roaming Pass only bill on days you actually use your phone. Skip a day with data roaming off, and you won’t be charged for it.

What’s the difference between Optus Zone 1 and Zone 2?

Zone 1 covers roughly 110 to 170 destinations. Daily Roaming, the Roaming Pass, and Prepaid Roaming Packs all apply there. Zone 2 destinations — including Turkey, Mexico, South Africa, and India — aren’t eligible for any of those capped products. Standard Roaming rates apply instead.

How much does Optus charge without a roaming pass?

Standard Roaming rates run around $1 per MB of data. Calls cost $1.50 to $4 per minute. Texts run $0.50 to $1, depending on destination.

Can I use an eSIM and keep my Optus SIM active at the same time?

Yes. Most modern phones support dual SIM, with an eSIM alongside your physical Optus SIM. Keep Optus active for calls and texts. Switch data roaming off so it isn’t charging you while your eSIM handles data.

Is an eSIM cheaper than Optus roaming for a two-week Europe trip?

In almost every case, yes. A fixed-data eSIM plan for a single European country typically costs less than three days of Optus’s cheapest Daily Roaming pass. It can cover the full two weeks.