--- title: "eSIM - How Does It Work?" description: "Learn about the digital alternative to physical SIM cards. Discover why eSIMs are becoming the standard for mobile connectivity." url: https://help.wonderconnect.com/en/articles/4-esim-how-does-it-work collection: "Getting Started" updated: 2026-11-02 language: en alternates: [de, pl] --- # eSIM - How Does It Work? Learn about the digital alternative to physical SIM cards. Discover why eSIMs are becoming the standard for mobile connectivity. ## What Is an eSIM? You probably know what a traditional plastic SIM card looks like. Now, imagine a chip similar to the one on the plastic SIM card, already built into your device. That chip in your phone is like an empty slot waiting for a command to activate the eSIM. The name "eSIM" comes from "embedded SIM". Thanks to this technology, you can use your regular SIM card for calls and messages and WonderConnect eSIM for mobile data. The best part is that you don't need technical knowledge to use an eSIM. You only have to provide the codes that program the chip to work under certain conditions. This process is called eSIM installation. In other words, instead of inserting a plastic card into your phone, you only input the information via the phone's settings to make the eSIM receive the signal. You get the activation codes from the provider after you purchase the eSIM. ## Why Use an eSIM? eSIM technology has been around for a while, and it seems it will become a standard solution, replacing traditional plastic SIM cards. eSIM technology allows you to have several numbers or data plans on your phone and switch between them without juggling tiny plastic cards. Besides the convenience, it prevents you from losing all your contacts and messages. You keep your phone number and use the eSIM only for mobile data. The convenience, price, and safety make them a common choice among travelers. eSIMs are the best option for staying connected to the internet while visiting foreign countries. > **Success:** 🌱 **We care about the environment** 🌱 > > Every eSIM saves about 4 grams of plastic. It may seem insignificant, but multiplied by a million, we're talking about tons of plastic waste! Besides, recycling traditional plastic SIM cards is quite a challenge. They are made of plastic and different kinds of metals, including gold, which means they can't be recycled with other plastic waste. By selecting an eSIM, you contribute to eco-friendly connectivity. ## eSIM Compatible Device  To use eSIM, you need a device that supports that technology. Your phone has to be equipped with the built-in chip we mentioned at the beginning of the article. Many modern smartphones come with this option. In addition to smartphones, you can use eSIM with tablets and smartwatches. > **Info:** We provide users with a list of compatible devices at checkout. ## eSIM Installation If your device is compatible, you can select a provider and buy an eSIM. There are eSIMs with phone numbers and data-only plans. At WonderConnect, we offer mobile-data-only plans that make it easy and affordable to stay connected to the internet abroad. You can keep your regular number to receive calls and messages and use the eSIM only for mobile data to avoid high roaming charges. After you select and purchase the eSIM, we will share a unique QR code and activation code. These codes contain all the necessary information to install the eSIM profile onto your device. You just have to scan the QR code or copy and paste the activation code into your phone's settings. This process replaces putting a plastic SIM card into your phone. > **Info:** We've prepared an installation guide to help users complete the eSIM installation process. It's available in the app after purchasing an eSIM. ## eSIM Mobile Data Activation and Switching Lines  The beauty of eSIM is that you can easily switch between different data plans or carriers without removing a traditional SIM card from your phone. You manage your eSIM in the settings, deciding which line to use for calls and messages and which one for mobile data. You can also turn your eSIM on and off.  > **Info:** With an eSIM, you can say goodbye to the hassle of physically swapping SIM cards and enjoy seamless connectivity wherever you go.