What Is an eSIM? How It Works and Why It's Cheaper Abroad
A plain explanation of the digital SIM built into your phone — how it works, whether your handset has one, and what it actually costs to use one abroad.
An eSIM is a digital SIM card built into your phone at the factory that cannot be removed. The name is short for embedded SIM.
Instead of inserting a card, you download the carrier profile over the internet. In practice that means one very specific thing: you can buy your destination's data plan while sitting at home, before you board the plane.
Here's how it works, whether your phone has one, and what it actually costs.
How it works
A traditional SIM is a small plastic chip with your carrier details written onto it. Changing carrier means physically changing the card.
With an eSIM the chip is soldered to the phone's mainboard and is reprogrammable. When you buy a plan you receive a QR code; you scan it with the phone's camera and the profile downloads and installs over the internet. The process takes two to five minutes.
Your phone can hold several profiles at once. Your home line stays where it is, a Japan plan gets added alongside it, and you switch between them in settings. Nothing is removed or inserted.
Why it's so much cheaper abroad
This is the real difference. Your carrier's roaming plan connects you to the foreign network via your home line, and the cost of that inter-carrier arrangement lands on your bill.
A travel eSIM skips that chain: you buy data directly from a network in the destination country. In most destinations the gap is several times over.
Cheapest plans as of August 2026, minimum seven days of validity:
| Destination | 1 GB / 7 days | 5 GB | With YAZ30 (5 GB) |
|---|---|---|---|
| Turkey | $1.43 | $4.82 | $3.37 |
| Spain / Italy / UK | $1.77 | $6.31 | $4.42 |
| United States | $1.86 | $6.36 | $4.45 |
| Malaysia | $1.95 | $4.24 | $2.97 |
| Thailand | $1.95 | $7.05 | $4.93 |
| Europe (33 countries) | $1.98 | $7.47 | $5.23 |
| Japan | $2.17 | $5.75 | $4.02 |
| South Korea | $2.17 | $5.14 | $3.60 |
Five gigabytes covers a week of normal use, which lands between three and five dollars in most destinations once the YAZ30 code is applied. Prices move with the catalogue — each destination page carries the current figure.
It's only fair to state the reverse too: we are not the cheapest everywhere. Destinations such as Morocco, Andorra, Egypt, Mexico and the Gulf states run considerably higher because local wholesale network rates are higher, and it's worth comparing before you buy.
Does your phone have one?
Fastest check: open Settings → Mobile Data (or Cellular). If you see an option like Add eSIM or Add Data Plan, your phone supports it.
Broadly supported:
- iPhone — XS, XS Max, XR and later (every model from 2018 on)
- Samsung — Galaxy S20 and later, Note 20, Z Fold and Z Flip
- Google Pixel — Pixel 3 and later
- Others — Huawei P40 and Mate 40, some Xiaomi from 12T Pro, Oppo Find X3 and later, Motorola Razr
Two warnings matter. First, the phone must be carrier-unlocked — a locked handset rejects third-party profiles. Second, some regional versions of the same model don't have it, which is common on phones built for the Chinese market.
There's a fuller breakdown in eSIM compatible devices and a filterable list on the compatible devices page.
What a travel eSIM does and doesn't do
The most misunderstood part:
It does: internet. Mobile data, hotspot sharing, and voice or video calls through apps like WhatsApp and FaceTime.
It doesn't: give you a local phone number, or carry traditional calls and SMS.
That isn't a shortcoming, it's a design choice — and it works in your favour. Because your number doesn't change, your regular line stays active on the phone: your bank's verification code and your family's call still reach you normally. The eSIM takes over only the internet, which is the expensive part.
Install before you fly
The most common mistake is trying to install after arriving. Installation needs internet because the profile downloads at that moment. No connection, nothing to download.
The right order:
- Buy the plan; the QR code arrives by email
- At home, on Wi-Fi, scan the code and install the profile
- Get on the plane
- On arrival, switch on the eSIM line and enable data roaming for that line only
Step four sounds wrong but is correct: the travel profile connects by design by roaming onto a local host network. Leave roaming off for your home line so it stays reachable without generating charges.
Installing early costs you nothing: the plan's validity starts at first network connection in the destination country, not at installation.
Who it makes sense for
- Holiday travellers — a week's plan costs a few dollars
- Frequent business travellers — install on the plane, land connected
- Digital nomads — several country profiles on one phone
- Anyone running two lines — separate work and personal numbers on one handset
If you're not sure how much data you need, this guide breaks it down hour by hour, or the package recommender sizes it from your destination and trip length.
Frequently asked questions
What is an eSIM?
An eSIM is a digital SIM built into the phone during manufacturing that cannot be removed. The name is short for embedded SIM. Instead of inserting a plastic card, you download the carrier profile over the internet by scanning a QR code. The phone can store several profiles at once and switch between them in settings without changing anything physical.
What does eSIM mean?
eSIM stands for embedded SIM. Embedded refers to the chip being soldered onto the phone's mainboard rather than sitting in a removable tray. Its job is identical to a traditional SIM: identifying you to a mobile network. The difference is that it is loaded by software rather than physically inserted.
Does my phone have an eSIM?
Most phones from 2018 onwards do: iPhone XS and XR and later, Google Pixel 3 and later, Samsung Galaxy S20 and later. The fastest check is to open Settings, find the mobile or cellular data section, and look for an option called Add eSIM or Add Data Plan. If it appears, your phone supports it. The handset must also be carrier-unlocked, because locked phones reject third-party profiles.
Does an eSIM change my phone number?
No. A travel eSIM carries data only and does not touch your number. Your existing line stays active on the phone, so calls and bank verification codes still reach you normally. The eSIM handles only the internet connection, which is the expensive part of international roaming.
How much does an eSIM cost?
It depends on the destination and the amount of data. Entry plans of 1GB for seven days run from $1.43 for Turkey and $1.77 for the UK, Italy or Spain, up to over $4 in destinations such as Morocco, Mexico or the UAE. The 5GB that covers a typical week of normal use usually costs between $4 and $7, and the code YAZ30 takes a further 30% off at checkout.
Can I install an eSIM without internet?
No — installation needs a connection because the profile downloads at that moment. Install it before you travel while you are on home Wi-Fi. Installing does not start the plan: the validity period begins when the phone first connects to a network in the destination country, so installing early costs you nothing.
Is an eSIM better than a physical SIM?
For travel of a few days to a few weeks, generally yes: you buy and install before departure and land connected, with no airport kiosk or queue. A local physical SIM is still cheaper for stays of several months and is the only option on phones without eSIM support. The two also work together — home SIM in the tray for calls, travel eSIM for data.
Can I cancel an eSIM after installing it?
Travel eSIMs are prepaid and involve no contract or auto-renewal. When the validity period runs out the plan simply ends and your card is not charged again. If you want the profile off your phone you can delete it in settings; there is no customer service line to call to unsubscribe.
