What is eSIM: how it works and how it differs from a regular SIM

📱 What is eSIM in simple terms

eSIM (embedded SIM, or built-in SIM card) is a digital analogue of the familiar plastic card that you insert into your phone. The main difference is that eSIM is already built directly into the device's motherboard and does not require physical replacement. Instead of going to a mobile shop and inserting a tiny card into a slot, you simply scan a QR code — and within seconds you have a new plan working.

For tourists this is a real revolution: no more need to search for a local SIM card upon arrival, stand in queues, and figure out a foreign operator's app interface. It's enough to buy an eSIM in advance, at home, and activate it at the moment of boarding or immediately after landing.

⚙️ How eSIM technology works

A regular SIM card stores information about your plan and operator on a physical chip. eSIM works differently: the chip is already embedded in the device, and the operator's profile (i.e., information about the plan, country, and network settings) is downloaded remotely via the internet.

The connection process looks like this:

1. You buy an eSIM from a provider — for example, on the e7m.ru platform, which specializes in eSIM for travel around the world.
2. An email arrives with a QR code and instructions.
3. You open your phone settings, select the "Mobile" or "SIM cards" section and click "Add plan".
4. Your phone asks you to point the camera at the QR code — you do this, and the operator's profile loads automatically.
5. Done: eSIM is activated, internet works.

Important: to scan the QR code you will need an active internet connection — Wi-Fi at home or at the airport. Therefore, activate eSIM before disconnecting from your home network.

🔍 How to check if your phone supports eSIM

Before buying an eSIM, make sure your device is compatible. There are two simple ways:

• Through settings: go to "Settings" → "General" (on iPhone) or "Settings" → "About phone" (on Android) and look for "Available SIM" or "eSIM plans".
• Using the secret code *#06#: dial this code on your phone's keypad like a regular call. Device information will appear on the screen. Find the line EID (Embedded Identity Document) — this is the unique identifier of your embedded eSIM chip. If the EID line is present, your phone supports eSIM. If it's not there, the device is not compatible.

eSIM is supported by iPhones starting with the XS model (2018), most flagship Samsung Galaxy S and Z series phones, current Google Pixel models, as well as a number of Huawei, Xiaomi and other brands. Budget and outdated smartphones most often do not support eSIM.

✈️ Why eSIM is convenient for travelers

• No need to change cards: your Russian SIM remains in your phone, you simply switch between profiles.
• Cost savings: tourist eSIMs are usually several times cheaper than roaming from Russian operators.
• Speed: you can buy and activate in 5 minutes without leaving home.
• Security: no need to fear losing a tiny card in a foreign country.

🛒 Where to buy eSIM for travel

Russian tourists find it convenient to use specialized platforms where you can choose an eSIM by country or region, compare plans and get support in Russian. One such service is e7m.ru — it offers eSIM for most popular tourist destinations: Europe, Asia, Middle East, Americas and other regions. The website interface is in Russian, and the QR code with instructions is sent to your email immediately after payment.

Before buying, always check that the selected plan supports data transmission (Data), not just calls. For most tourists, mobile internet is what matters.

eSIM is a modern, convenient and economical way to stay connected abroad. Once you understand the technology, you're unlikely to want to go back to searching for local SIM cards in an unfamiliar city.