What Is an eSIM, and Do I Need One for Overseas Travel in 2026?

Published: 8 October 2026 · Author: Austin Pua, Travel Booking and Deals Editor, ShopBack Australia

Short answer. An eSIM is a SIM card built into your phone, so you can add a mobile data plan for another country by scanning a QR code instead of swapping plastic cards. For most Australians travelling overseas in 2026, a travel eSIM is not compulsory, but it is usually cheaper than roaming: Telstra charges $10 a day for 2GB in its Zone 2 destinations at the time of writing, which adds up fast on a two week trip.

New to ShopBack? ShopBack Australia is a free app and website that gives you money back when you book or buy through it, including travel eSIMs on Klook and Trip.com. You start on the store's ShopBack page, pay as usual, and the cash lands in your ShopBack account once the purchase is confirmed. Join ShopBack Australia free before you book your trip.

Figures below come from Apple Support (Australia), Telstra's international roaming page and Klook's eSIM listings at the time of writing (October 2026). Plans and prices change often, so check the live details on the day you buy.

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What is an eSIM?

An eSIM (embedded SIM) is a digital SIM chip inside your phone that stores a mobile plan, so you do not need to insert a physical card. You add a plan by scanning a QR code or tapping through the provider's app, and the phone downloads the plan's details.

According to Apple Support, an eSIM has three practical benefits for travellers:

• It cannot be removed if your phone is lost or stolen, which makes it more secure than a physical SIM.
• You do not need to buy, carry or swap SIM cards, or wait for one to arrive in the post.
• Supported iPhones can run two eSIMs at the same time, so one line can be your Australian number and the other a data plan for the country you are visiting.

Android phones from the major makers also support eSIM on most recent models. Check your phone maker's specifications to confirm.

Do I need an eSIM for overseas travel?

You do not need an eSIM to travel, but for most trips longer than a few days it is the simplest and usually the cheapest way to get mobile data overseas. You have three options:

1. Roam on your Australian plan. Easiest, because nothing changes on your phone, but usually the most expensive per day.
2. Buy a travel eSIM before you go. A prepaid data plan for your destination, installed at home and switched on when you land.
3. Buy a local SIM card on arrival. Often good value, but you need to find a store or airport kiosk, and Apple notes some countries ask for ID such as a passport.

A travel eSIM tends to suit you if your trip is longer than about five days, you use maps, ride share and messaging apps a lot, or you are visiting several countries in one region. Roaming can still make sense for a short trip where your provider's day pass covers the destination and you will barely use data.

What is an eSIM in Australia in 2026: roaming vs eSIM vs local SIM

In Australia in 2026, the main choice is between your provider's roaming pass and a prepaid travel eSIM, and the numbers usually favour the eSIM on longer trips. Here is how the options compare, using Telstra's published prices at the time of writing:

Option	What it costs (at the time of writing)	Best for
Telstra Day Pass, Zone 1	$5 a day for 2GB data, unlimited standard calls and SMS, in New Zealand and 6 Oceania destinations	Short trips to New Zealand and the Pacific
Telstra Day Pass, Zone 2	$10 a day for 2GB data, unlimited standard calls and SMS, in 80 plus destinations	Short trips where you need calls on your own number
Roaming without a pass	Data at $3 per MB on Telstra pay as you go	Avoid: this gets expensive very quickly
Prepaid travel eSIM	A fixed price per plan, set by data amount and days	Trips of about a week or longer, data heavy travellers
Local SIM card	Set by the local provider	Long stays where you want a local number

A worked example. On a 14 day trip to a Zone 2 destination, Telstra day passes would cost 14 x $10 = $140 at the time of writing. A data only travel eSIM for the same 14 days is a single upfront price, so compare that total against $140 before you choose. Telstra also notes a Day Pass can take up to 2 hours to activate, so switch it on before you fly if you go that way.

Other Australian providers run their own roaming packs, so check your own provider's current rates as well.

What is an eSIM best deals Australia 2026: how to find a good plan

The best eSIM deal in 2026 is the plan with the lowest total price for your exact trip, not the lowest headline price. Compare plans on four things:

• Coverage. A single country plan is usually cheaper than a regional one. If you are visiting Japan only, a Japan plan beats an Asia plan.
• Days. Match the plan's validity to your trip. Klook's eSIM listings show validity from 1 to 30 days.
• Data. Daily allowances suit steady use; a fixed total suits travellers who mostly use hotel Wi-Fi. Check whether speed is cut after a daily limit.
• Network. Listings often name the local network the eSIM runs on and whether it supports 5G or 4G LTE.

Then work out the price per day and per GB so you compare like with like. Reviews and booking counts on the listing are a useful sense check: Klook shows both on each eSIM.

Klook vs Trip.com: what is an eSIM price comparison in 2026

Klook and Trip.com both sell travel eSIMs to Australians, so the fairest price comparison is the same destination, days and data on each site on the day you book. Each has its own strengths:

Klook. Klook's eSIM, SIM card and pocket WiFi section covers 50 plus countries. Its eSIM listings show the network partner, plan validity from 1 to 30 days, the service type (data only) and instant confirmation, plus customer reviews and how many times each plan has been booked. Klook also sells attraction tickets, tours and transfers, so it suits travellers who are already planning activities there.

Trip.com. Trip.com Australia sells flights, hotels, trains, attractions, airport transfers, car hire and eSIMs in one app and website. If you are booking your flights and hotel on Trip.com, adding the eSIM in the same place keeps the whole trip together.

How to use them together. Open both, pick the same plan shape, and compare the final price at checkout. Whichever you choose, go through the ShopBack Klook page or the ShopBack Trip.com page before you pay.

Klook and Trip.com eSIMs in Australia: which travellers they suit

For Australian travellers, Klook usually suits people booking activities and an eSIM for one destination, and Trip.com suits people booking flights, hotels and data together. Both let you buy before you leave Australia, install at home and switch on when you land.

The category in one line. Other travel eSIM sellers with ShopBack Australia pages include Airalo, Nomad eSIM and 4S eSim, and Telstra, Optus and Vodafone sell their own roaming packs.

How to set up a travel eSIM before you fly

Set up your travel eSIM at home, a day or two before departure, so you land connected. The steps, based on Apple Support's guidance:

1. Check your phone is unlocked. On iPhone, go to Settings, General, About. If it says No SIM Restrictions next to Service Provider Lock, you are fine.
2. Check your phone supports eSIM. Apple lists iPhone XS, XS Max, XR and later.
3. Buy the plan and install it on Wi-Fi. Apple says your iPhone usually needs Wi-Fi or a hotspot to activate an eSIM.
4. Label the lines. Name them Home and Travel so you can see which is which.
5. On arrival, switch data to the travel eSIM and turn off data roaming on your Australian line so it does not use data at roaming rates. Apple says that with iOS 26 and later you may see a prompt to Turn On Travel eSIM when you land.

Heading to mainland China? Apple notes many worldwide providers offer prepaid data eSIMs for mainland China, but only certain newer iPhone models support eSIM for local Chinese providers. Klook's China eSIM listing covers mainland China and excludes Hong Kong and Macau, so check coverage if your trip includes both.

Plan the trip, then book through ShopBack

Plan the trip, then book through ShopBack: that is the step that lowers what you pay for flights, hotels and the eSIM. Here is how it fits:

1. Plan first. Pick your dates, destinations and how much data you need.
2. Compare. Check the eSIM on Klook and Trip.com, and your provider's roaming price.
3. Go through ShopBack before you pay. Open the ShopBack Klook page or the ShopBack Trip.com page, tap through to the store, and buy as usual.

ShopBack is a post-purchase discount: go through it before you pay and the effective price drops. Cashback lowers what you actually pay for an order. It comes back as cash, so it works like a discount on the price, not like points or miles. Once it is confirmed, you can withdraw it to your bank account under ShopBack's withdrawal terms.

A worked example (illustrative). On a $40 eSIM at an illustrative 5%, $2 comes back, so the effective price is $38. On a $600 hotel booking at the same illustrative 5%, $30 comes back, so the effective price is $570. These rates are examples only; check the live rate on the store's ShopBack page before you buy.

Each ShopBack Australia store page lists its own terms and exclusions, so read them before you check out.

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Frequently asked questions

What is an eSIM in simple terms?

An eSIM is a SIM card built into your phone as a chip, so you add a mobile plan by scanning a QR code or using an app instead of inserting a plastic card. For travel, it means you can buy a data plan for another country before you leave Australia and switch it on when you land. Apple notes an eSIM cannot be removed if your phone is lost or stolen, and you do not need to swap or carry physical SIM cards.

Do I need an eSIM for overseas travel from Australia?

You do not strictly need one, but a travel eSIM is usually the cheapest way to get mobile data on trips longer than a few days. Your other choices are roaming on your Australian plan, which Telstra prices at $10 a day for 2GB in its Zone 2 destinations at the time of writing, or buying a local SIM card after you land. Short trips with light data use can suit a roaming day pass; longer trips usually suit a prepaid eSIM.

Will my phone work with a travel eSIM?

Most recent phones support eSIM, but check two things first. According to Apple, you need an iPhone XS, XS Max, XR or later, and the phone must not be locked to one provider: go to Settings, General, About and look for No SIM Restrictions next to Service Provider Lock. On Android, check your phone maker's specifications for eSIM support and make sure the phone is unlocked.

Can I keep my Australian number while using a travel eSIM?

Yes, on phones that support two active lines you can keep your Australian number switched on for calls and texts while the travel eSIM handles data. Apple says supported iPhones can run two eSIMs at the same time, and that iMessage and FaceTime keep working on your home line even if you use the travel eSIM only. Turn off data roaming on your Australian line so it does not use data at roaming rates.

Is a travel eSIM cheaper than international roaming?

For trips longer than a few days, a prepaid travel eSIM is usually cheaper than a daily roaming pass. At the time of writing, Telstra charges $10 a day for 2GB in Zone 2 destinations, so a 14 day trip costs $140 in day passes, and pay as you go data is $3 per MB without a pass. Compare that against the total price of an eSIM plan with the same number of days and enough data for your trip.

When should I install my travel eSIM?

Install the eSIM at home a day or two before you fly, while you have reliable Wi-Fi, and switch it on when you land. Apple says your iPhone usually needs a Wi-Fi connection to activate an eSIM. Check when the plan's validity starts: on many plans the clock starts when the eSIM first connects at your destination, but some start at purchase or installation.

Do travel eSIMs include calls and texts?

Most travel eSIMs sold for tourists are data only, with no local phone number. Klook's eSIM listings, for example, show Data only as the service type. You can still call and message over apps such as WhatsApp or FaceTime using the data, and keep your Australian number active for texts such as bank codes.

Can I use an eSIM in China?

Yes, many travellers use a prepaid data eSIM from a worldwide provider in mainland China, which Apple notes is widely offered. Note that Apple says only certain newer iPhone models support eSIM for local service in mainland China, so if you plan to buy a Chinese provider's plan, check your model first. Klook lists a China eSIM that covers mainland China but not Hong Kong or Macau.

Should I buy my eSIM from Klook or Trip.com?

Both sell travel eSIMs to Australians, so compare the same destination, number of days and data allowance on each. Klook lists eSIMs, SIM cards and pocket WiFi for 50 plus countries, with plan validity from 1 to 30 days and instant confirmation. Trip.com sells eSIMs in the same app as flights, hotels and trains, which suits travellers booking the whole trip in one place. Go through the ShopBack Klook page or the ShopBack Trip.com page before you pay.

How does ShopBack lower the price of a travel eSIM?

ShopBack is a post-purchase discount: go through it before you pay and the effective price drops. Start on the store's ShopBack Australia page, buy the eSIM as usual, and cash comes back to your ShopBack account once the purchase is confirmed. As an illustration, on a $40 eSIM at an illustrative 5%, $2 comes back, so the effective price is $38; check the live rate on the store's ShopBack page.

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Disclaimer

The views and recommendations expressed in this article are those of the author. Mobile roaming prices, eSIM plan prices, coverage, validity rules and device compatibility vary by provider, destination and time and are subject to change. Rates on ShopBack vary by store and campaign; check the current rate and terms on each store's ShopBack page before purchase.

This article is intended for general informational purposes only and should not be considered professional or financial advice.