Will Telstra charge me if I only use the eSIM for data?

No, as long as data roaming is off on the Telstra line. A daily fee is triggered by the Telstra line using data, calls or texts abroad; with its data roaming off, only incoming texts and calls can reach it, and those are what your plan says they are.

Can I keep my Telstra number while using the eSIM?

Yes. The eSIM is data only and sits next to your Telstra SIM; calls and texts to your number still arrive on the Telstra line.

Does the travel eSIM work on a Telstra phone?

If the phone is unlocked and supports eSIM, yes; every iPhone since the XS and most Android flagships do. A phone still locked to Telstra will refuse the eSIM until it is unlocked.

Telstra international roaming: costs and the eSIM alternative

What Telstra charges abroad in 2026 (day passes, included data, per-megabyte rates), when to keep it on, and how a travel eSIM sits beside it.

Short answer: Keep Telstra roaming for a day or two, or where your plan already includes the country. For a longer trip, a travel eSIM for data costs a fraction of the daily fees, and your Telstra SIM stays in the phone for calls and texts.

If you are a Telstra customer heading abroad, the question is whether to pay Telstra’s roaming or buy a travel eSIM for data and keep your Telstra SIM for calls. Here is what Telstra charges as it describes it in 2026, when it is worth keeping, and how the two sit together in one phone.

What Telstra charges for international roaming

Telstra sells roaming as an International Day Pass: around A$10 a day for a capped amount of data (a few gigabytes) with unlimited calls and texts, charged for each day you use the phone, with multi-day packs for longer trips. Without a pass, Telstra charges per megabyte at rates that add up in minutes. The pass covers most countries Australians visit; New Zealand is included on some plans.

Prices change and differ by plan, so check your own plan on the carrier’s site or app before you fly; the shape of the offer (a daily fee, slow included data, or per-megabyte rates) is what matters when you compare.

When to keep Telstra roaming on

Keep the Telstra Day Pass for a short trip to New Zealand or Bali where calls and texts on your own number matter, or if your plan includes it.

When a travel eSIM is the better buy

Any trip of more than a few days: a prepaid plan for the country costs less than a week of daily fees.
Data for maps, video calls and a laptop hotspot: travel eSIM plans run at full 4G or 5G speed on local networks.
Several countries in one trip: one regional eSIM covers Europe, Asia or the Gulf without a new fee at each border.
Keeping your number: the Telstra SIM stays in the phone for calls and texts; the eSIM carries the data.

Three weeks in Europe on the Day Pass is 21 daily fees, around A$210. A ONE eSIM Europe plan with 20 GB for 30 days covers 30 or more countries for a fraction of that.

Using a travel eSIM alongside Telstra

Check the phone is unlocked. Telstra phones bought outright are unlocked; prepaid phones can be unlocked online, free after a period or for a small fee. Check before travelling, as a locked phone cannot use another eSIM.
Buy the plan for your destination and install it on Wi-Fi at home; the eSIM appears as a second line.
Set the travel eSIM as the mobile data line and turn data roaming on for that line only. Keep data roaming off on the Telstra line, so no daily fee is triggered by a background update.
Leave the Telstra line on for calls and texts if you want to be reachable; receiving texts abroad is usually free, calls may not be.
When you land, the eSIM connects to a local network and the plan starts. Your home number keeps working for calls.

FAQ: roaming with Telstra and a travel eSIM

Will Telstra charge me if I only use the eSIM for data? No, as long as data roaming is off on the Telstra line. A daily fee is triggered by the Telstra line using data, calls or texts abroad; with its data roaming off, only incoming texts and calls can reach it, and those are what your plan says they are.
Can I keep my Telstra number while using the eSIM? Yes. The eSIM is data only and sits next to your Telstra SIM; calls and texts to your number still arrive on the Telstra line.
Does the travel eSIM work on a Telstra phone? If the phone is unlocked and supports eSIM, yes; every iPhone since the XS and most Android flagships do. A phone still locked to Telstra will refuse the eSIM until it is unlocked.