Olin > Blog > What Is an eSIM? Features and Advantages
What Is an eSIM? Features and Advantages
The eSIM is a simple, free, and eco-friendly evolution of the traditional SIM card. Discover how it works and all the advantages of switching to an eSIM.
The eSIM replaces the physical SIM card with a digital version that installs directly on your device. It allows you to activate your mobile line in just a few minutes—no plastic, no shipping, and no waiting.
What Is an eSIM?
An eSIM (embedded SIM) is a digital SIM card built directly into your device. You don’t need to insert a physical chip. Your mobile line’s profile is downloaded and stored securely on your phone.
This means less hassle and more flexibility, allowing you to manage multiple lines from a single device.
How Does an eSIM Work?
The eSIM integrates a reprogrammable UICC (Universal Integrated Circuit Card) chip inside your device, defined by the GSMA standard. It works just like a physical SIM but is managed remotely through Remote SIM Provisioning (RSP).
When you sign up for a service, your operator provides a QR code or an activation link. Scanning it connects your device to the operator’s SM-DP+ server, which securely downloads an encrypted profile containing your network credentials (IMSI, authentication keys, and service parameters). This profile is stored safely in the internal chip, allowing your phone to authenticate on the mobile network—just like with a physical SIM.
An eSIM can store multiple profiles at once, so you can switch between lines or data plans without changing cards. And because it’s embedded in the device, it offers better protection against loss or SIM cloning.
Advantages of an eSIM
The eSIM offers clear benefits compared to traditional SIM cards:
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Free: You pay nothing to activate it. Just choose your plan and receive your installation code in seconds.
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More convenient: No need to order or wait for a physical card. Everything happens digitally.
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More secure: With no physical chip to lose or steal, your line is safer. Plus, you can manage it directly from your phone.
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Faster activation: Scan a QR code, and in seconds your line is ready for calls, browsing, and data.
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More eco-friendly: By eliminating plastic and shipping, eSIM reduces environmental impact—an eco-conscious alternative to traditional SIM cards.
Which Devices Support eSIM?
More and more manufacturers are adding eSIM technology to their smartphones, tablets, smartwatches, and laptops.
Some of the most common eSIM-compatible devices in Spain include:
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iPhone XR and newer models
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Samsung Galaxy S20 and above
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Google Pixel 3 and newer
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Huawei P40, Mate 40, and later models
It’s also standard in smartwatches such as Apple Watch and Samsung Galaxy Watch, as well as laptops from Lenovo, Dell, and Microsoft Surface.
How to Activate an eSIM
Activating your eSIM is quick and easy:
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Request your eSIM from your mobile operator.
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You’ll receive an email with your QR activation code.
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Scan the QR code from your mobile settings under Mobile Data or SIM Management.
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In seconds, your line will be active and ready to use.
If you switch devices, you can simply request a new eSIM code.
Olin’s eSIM
At Olin, we offer our customers the latest eSIM technology—a step forward in how you stay connected. With this option, you can request your mobile line in the most advanced format available and enjoy all the benefits of modern connectivity.
The eSIM represents Olin’s commitment to innovation and sustainability, while maintaining the local, human touch that defines us on the Costa del Sol. Whether you’re already part of the Olin family or joining us for the first time, you can trust that you’re choosing an operator that combines cutting-edge technology with personal service.
Olin Mobile Plans
Our mobile plans, with nationwide 4G coverage and 5G-ready zones, are designed to make the most of your eSIM-compatible devices. Whether for personal use, remote work, or travel, Olin gives you flexibility, reliable connectivity, and friendly local support every step of the way.
FAQs
Can I keep my current phone number with an eSIM?
Yes, you’ll keep the same number—only the format changes.
How do I know if my device supports eSIM?
Check your phone’s Mobile Data settings or visit the manufacturer’s website. You can also ask us at any of our Olin Stores in Costa del Sol, Cádiz, or Huelva.
Can I use both an eSIM and a physical SIM at the same time?
Yes. Many devices support dual SIM (eSIM + physical SIM)—perfect for separating work and personal life, or for combining your Spanish line with an international travel eSIM.
If I change phones, can I use my eSIM on another device?
Of course. Just request a new QR code from your Customer Area or any Olin Store.
What if I want to switch from eSIM to a physical SIM?
No problem—we’ll handle the change for you in minutes.
Can I use my eSIM when traveling abroad?
Yes. With Olin, you get free roaming in the EU and coverage agreements in over 100 countries, including the U.S. and Morocco. You can also buy temporary travel eSIMs if you prefer.
If I delete my eSIM or reset my phone, can I reactivate it?
Yes. You can simply request a new QR code to reinstall it.
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