What Is an eSIM? A Plain Guide for Travellers
An eSIM is a SIM that lives inside your phone as a chip, not as a plastic card in a tray. Instead of inserting something, you install a plan onto it from a link or a QR code. For a traveller, that means you can buy data for your next trip at home, install it in a couple of minutes on Wi-Fi, and land connected.
What an eSIM actually is
eSIM stands for embedded SIM. Every phone that uses a mobile network needs a SIM: it identifies the phone to the network and holds the details of your plan. A physical SIM is a small card that you move between phones. An eSIM does the same job with a chip built into the phone, and the plan arrives as a download instead of in an envelope.
One phone can store several eSIM plans and switch between them in Settings. Most phones that support eSIM also keep a physical SIM slot, so your home line and a travel line can run side by side. Some recent iPhones, including US models from iPhone 14 onward, have no SIM tray at all and use eSIM only. For a side-by-side look, read eSIM vs physical SIM.
How you install one
When you buy a plan, you receive an activation code. It is usually shown as a QR code, and on iPhone it can also be a link that opens the setup screen directly. Your phone uses that code to download the plan and store it on the chip. The plan then appears as a second line in your mobile settings, next to your home line.
With e-sim.net the steps are:
- Pick a destination on the eSIM page and pay with Apple Pay, Google Pay or card. Your account is created from the payment, with no form.
- Open the install page. It opens after payment, and the link is in your receipt. On iPhone, tap the install link. On other phones, scan the QR code from a second screen.
- Install at home on Wi-Fi, a day or two before you fly. Outside the plan's coverage the new line stays quiet until you arrive. If the plan also covers your home country, such as a Europe eSIM bought in France, switch the line off until you leave, or it can connect at home and start its validity early.
- Land. The eSIM connects to a local network and your data starts.
Step-by-step screens are in our guides for iPhone and Android.
What a travel eSIM does, and what it doesn't
What you get
- Data on arrival. No shop, kiosk or queue at the airport.
- Your number stays. The home SIM stays in the phone for calls and SMS while the eSIM carries the data. WhatsApp and iMessage keep working on your usual number; see how to keep your WhatsApp number abroad.
- Prepaid, nothing renews. You pay once. If you need more data, you top up with a deliberate tap from your account.
- Validity starts when you land. The clock starts when the phone first connects to a network in the destination, not when you buy, so buying early doesn't use up days.
What it doesn't do
- Most plans are data only. There is no local phone number, so calls and messages go through apps over that data. The US and UK also have a few plans with a local number plus minutes and SMS; the US and UK pages show them.
- It needs a compatible, unlocked phone. A phone without an eSIM chip, or one locked to its carrier, will not accept it. Check your phone before you buy.
- It needs internet to install. Install before you leave, while you still have Wi-Fi you trust.
Who a travel eSIM suits
An eSIM works well for short trips, city breaks and multi-country routes, where hunting for a local SIM in every country costs time. A regional plan such as Europe covers many countries on one install. It also suits anyone who wants their home number reachable the whole time.
It is less useful if your phone is locked, or if your home plan already includes the destination at home rates. If you are weighing it against your carrier's travel option, read eSIM vs roaming. Visiting Europe from outside the EU? See roaming in Europe without an EU SIM. For the full journey from purchase to landing, see how a travel eSIM works.
How much data to buy
Our plan recommender uses three daily rates, and so can you:
- Maps and messaging: about 0.2 GB a day.
- Socials and photos: about 0.5 GB a day.
- Streaming or hotspot: about 1.3 GB a day.
Multiply by the days of your trip and add 15% headroom. A week of socials is 3.5 GB, or about 4 GB with headroom. Two weeks of maps and messaging is 2.8 GB, or about 3.2 GB. Every destination page shows the current plans and prices, for example Japan.
Is it safe?
An eSIM can't be pulled out of a stolen phone and put into another one, which closes one easy route for a thief. It doesn't change how your home number is protected against SIM-swap fraud, which happens at your carrier. We cover both, and what we store about you, in is an eSIM safe.
Before you buy
- Your phone supports eSIM and is carrier-unlocked.
- You know roughly how many days and what kind of use.
- You will have Wi-Fi to install a day or two before the flight.
If this is your first time, our first-trip eSIM FAQ answers the questions people ask most, from validity to hotspot.
Questions
Is an eSIM the same thing as a travel eSIM?
No. eSIM is the technology: the chip inside your phone. A travel eSIM is a prepaid data plan you install on that chip for a trip. Your home carrier can also put your regular line on eSIM, and both can sit on the same phone.
Can I use an eSIM and my physical SIM at the same time?
Yes, on most phones that support eSIM. The usual travel setup is your home SIM for calls and SMS and the travel eSIM for data, both switched on.
Do I need Wi-Fi to install an eSIM?
You need an internet connection, because the phone downloads the plan. The easiest way is home Wi-Fi a day or two before you fly.
What happens if my eSIM never connects?
You get a full refund. Email hello@e-sim.net with your order id. Once an eSIM has connected to a network, the plan counts as used and isn't refunded.