What Is an eSIM and How Does It Work? A Plain-Language Guide
An eSIM is a SIM card built into your phone as a chip called an eUICC. Instead of inserting plastic, you download your carrier profile digitally, usually by scanning a QR code. It does everything a physical SIM does. Before you buy, check that your phone supports eSIM, then install the profile by QR and activate it when you arrive abroad.
Picture the queue at any airport arrivals hall: tired travelers hunting for a kiosk that sells plastic SIM cards, digging through backpacks for the metal pin that opens the SIM tray, and hoping the tiny old card does not get lost on the counter. An eSIM removes that whole scene. There is nothing to buy at a kiosk, nothing to insert and nothing to lose.
What is an eSIM? The meaning in one sentence
An eSIM (embedded SIM) is a SIM card that is already built into your phone as a small chip called an eUICC. Instead of inserting a piece of plastic, you download a carrier profile onto that chip digitally, usually by scanning a QR code. The result is exactly the same as a physical SIM: your phone connects to a mobile network, gets a data plan and works normally.
This is not new or experimental technology. The iPhone XS brought eSIM to the mainstream in 2018, and most phones sold since 2019 support it, including the iPhone XS and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer.
How does an eSIM work, step by step?
- The eUICC chip inside your phone can store one or more carrier profiles, so one device can hold several plans at once.
- When you buy an eSIM plan, the provider generates a QR code that contains the download instructions for your profile.
- You scan the QR code, your phone downloads the profile over Wi-Fi or data, and the eSIM appears in Settings like any other SIM.
- Your physical SIM stays in the tray untouched, so your home number and WhatsApp keep working alongside the new eSIM.
See how Kudo eSIM works step by step
See how it worksDoes my phone support eSIM? Dial *#06#
The fastest check takes ten seconds. Open the phone app, dial *#06# and look at the screen that appears. If you see a long number labeled EID, your phone has the embedded chip and supports eSIM. No EID means your device relies on physical SIM cards only. As a rule of thumb, iPhone XS and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer all support eSIM.
The traveler flow: buy at home, activate abroad
- Buy online before your trip: with Kudo eSIM the QR code arrives instantly on screen and by email, and you pay in EUR with VAT included by card, Apple Pay or Google Pay.
- Install at home while you still have Wi-Fi: go to Settings, choose Add eSIM, scan the QR code, and activation takes about 30 seconds.
- Validity starts when the eSIM first connects to a network abroad, not at purchase, so buying days or weeks ahead costs you nothing.
- Land, turn on the eSIM line, and you are online at the gate while others are still looking for a kiosk.
The fears, demystified
The two worries we hear most often: that eSIM is complicated, and that it replaces your home SIM. Neither is true. Installation is a QR scan in Settings, and your home SIM stays exactly where it is, so calls to your number and your WhatsApp continue working. One honest limitation to know: on Kudo eSIM, hotspot sharing works on fixed-data plans but is not available on unlimited (Pa Limit) plans.
Kudo eSIM, the first eSIM provider from the Balkans since 2022, offers plans for 190+ countries. The Europe + Region eSIM covers 46 countries on a single eSIM, with fixed plans starting from 1 GB at EUR 1.20 and 45-day validity, plus top-ups in the app with no new QR code needed. Support chat is available, including in Albanian, and the site works in 20 languages.
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See the plansFrequently asked questions
What is an eSIM in simple terms?
An eSIM is a SIM card built into your phone as a chip called an eUICC. Instead of inserting plastic, you download your carrier profile digitally, usually by scanning a QR code. It does everything a physical SIM does, with nothing to insert or lose.
How does an eSIM work?
When you buy an eSIM plan, you receive a QR code. Scanning it downloads a carrier profile onto the embedded chip in your phone, and the eSIM then appears in Settings like a normal SIM. With Kudo eSIM the QR arrives instantly and activation takes about 30 seconds.
How do I know if my phone supports eSIM?
Dial *#06# on your phone. If the screen shows a long number labeled EID, your phone supports eSIM. Most phones sold since 2019 do, including iPhone XS and newer, Samsung Galaxy S20 and newer, and Google Pixel 3 and newer.
Does the eSIM start counting days from the moment I buy it?
Not with Kudo eSIM. Validity starts when the eSIM first connects to a network abroad, not at purchase. That means you can buy and install it at home in advance for free, and the clock only starts when you land and go online.
Can I keep my regular SIM and number while using an eSIM?
Yes. The eSIM works alongside your physical SIM in dual SIM mode, so your home number and WhatsApp keep working while the eSIM handles data abroad. You avoid roaming charges without giving anything up.
Can I share the eSIM data as a hotspot?
On Kudo eSIM, hotspot sharing is allowed on fixed-data plans, so you can connect a laptop or a travel companion. It is not available on unlimited (Pa Limit) plans, so pick a fixed plan if hotspot matters to you.
