Ultimate Guide: What is an eSIM? How does eSIM work?

Nowadays, more smartphones, tablets, and wearable devices adopt eSIM technology. eSIM is becoming the new standard for mobile connectivity, replacing traditional SIM in both travel and everyday life.

As a virtual SIM card is more convenient and secure, the day when physical SIM becomes less common may arrive sooner than you expect, making eSIM a useful skill for every traveler to learn.

In this guide, you’ll learn what is an eSIM and quickly know how does eSIM work. Keep reading to find out the key points.

What is eSIM?

eSIM stands for Embedded SIM card, which directly builds a programmable chip（eUICC） into your device’s motherboard and does not need to be inserted or removed physically. An eSIM acts like a passcode to unlock network access. users SIMply need to download SIM information provided by the carrier to activate your eSIM plan.

Beyond internet connectivity, most devices can store multiple eSIMs SIMultaneously and activate two at once, allowing users to easily switch between countries and carriers. Since eSIMs eliminate the need for a physical card slot, the saved space enables significant improvements in water resistance, battery capacity and other performances compared to standard models.

Most of the latest smartphones support eSIM. You can find out how to check if my phone is eSIM compatible here.

Why do we need an electronic SIM card?

The key difference between eSIM and physical SIM card is that the eSIM manages mobile network services digitally. This not only SIMplifies the activation process but also offers users greater flexibility for travel, business trips, and daily use. Here are some of the main advantages of eSIM:

• Instant Activation
• No need to handle a physical SIM card
• Easy to switch between carriers or data plans
• More Environmentally Friendly

To choose using eSIM or physical SIM, we recommend you to use an eSIM if you are a/an:

• Frequent travelers
• Users who want instant activation
• People who use multiple phone numbers
• Users who prefer a fully digital experience

How does an eSIM works?

Now that you understand the basic principles of eSIM and why it’s used, we’ll walk you through exactly how does eSIMs work.Follow these steps to start using an eSIM on your iPhone or Android.

Before you start, you must:

• check the availability of eSIM in your phone
• buy a reliable virtual SIM card.

Installation Guide for iOS Devices

Step 1 & 2
Go to: Settings → Mobile Data → Add eSIM

Step 3
Activate your eSIM phone plan using one of the following methods:

Option 1: One-Tap Activation
Follow the activation link provided after purchase.

Option 2: QR Code Activation
Scan the QR code supplied with your eSIM package.

Option 3: Manual Activation
Enter the activation details manually if required.

Step 4
Now you can enable embedded SIM card through:

• ✅ Mobile Data
• ✅ Data Roaming

For iPhone user, your eSIM is now ready to use.

How does eSIMs work on Android?You can follow these steps:

Step 1 & 2
Go to: Settings → Network & Internet / SIM Manager → Add eSIM
(Menu names may vary depending on device brand.)

Step 3
Activate your electronic SIM card using either one:

Option 1: QR Code Activation
Scan the QR code provided after purchase.

Option 2: Manual Activation
Enter the activation information manually.

Step 4
After completing the steps above, you can enable virtual SIM card with:

• ✅ Mobile Data
• ✅ Data Roaming

For Android users, your eSIM is now ready for use.

eSIM vs physical SIM

Is an eSIM better than a physical SIM? Our answer is definitely YES! If you want to learn more about it, you may quickly understand the difference between SIM and eSIM by the table below.

Feature	eSIM	SIM Card
Device Compatibility	❌ Requires an eSIM-compatible device.	✅ Supported by most mobile devices.
Number of Mobile Plans	✅ iPhones can store 8 or more eSIM profiles and use two at the same time.	❌ dual-SIM function is varies by device and the maximum is two.
Convenience	✅ No SIM swapping required. Purchase and activate instantly.	❌ Requires physical delivery and SIM card installation.
Security	✅ Harder to steal or physically clone. Lost devices can be remotely managed by your carrier.	❌ Can be removed and inserted into any another devices.
Switching Devices	❌ Not acquired to switch between devices for the safety reason.	✅ Can be moved freely between compatible devices.

Get eSIM plan with NPN Travel

NPN Travel has been serving travelers since 2009 and has supported millions of customers across the region, acting as one of the leaders of eSIM phone plan in all over the world. We promise stable connectivity, responsive support, and hassle-free activation wherever you go.

Once you understand what is an eSIM card and how it works, you can choose an NPN plan to travel with ease.

We provide:

• Extensive Network Coverage
• Cost effective data plan
• Reliable Travel Connectivity and Customer Support

How to get the cheapest eSIM plans?

Register to be our member and get a SGD5 voucher!

FAQ of Virtual SIM card

The following are frequently asked questions about using eSIM. You can quickly find answers to other questions besides basic ones like "How does an eSIM work?"

Conclusion

By now, you’ve learned what is an eSIM, how it differs from a SIM card, and how does eSIM work on iPhone and Android phones.You'll be ready to start using eSIM confidently and make your next journey smoother, smarter, and more connected.

When you need the best eSIM phone plans, with NPN Travel, you can travel with confidence knowing that help is always available. Come and explore for your next journey!