What is an eSIM Card and How Do eSIMs Work?

Heading into 2025, eSIMs are at the forefront of a technological shift toward more dynamic and borderless mobile connectivity. Gone are the days of fumbling with tiny plastic SIM cards—eSIMs are a digital, instant, and eco-friendly alternative to traditional chips.

Physical SIMs will likely remain relevant for budget phones, IoT devices, and regions with slower eSIM adoption. The Global System for Mobile Communications Association (GSMA) forecasts a shift to eSIM dominance by 2030, driven by growing demand for greener, more secure, and versatile connectivity solutions. The trend towards integrated and reprogrammable connectivity solutions positions eSIM cards as the future of mobile communication.

Whether you’re a frequent traveller, a tech enthusiast, or simply curious about upgrading your connectivity, this comprehensive guide covers everything about how to get an eSIM card. Next, it also discusses the eSIM functionality, benefits, practical applications for travel, how eSIMs work for international travel, and more.

What is an eSIM card?

An embedded Subscriber Identity Module, or eSIM, is a digital SIM embedded in your device’s hardware, eliminating the need for a physical plastic card. Unlike traditional SIMs, eSIMs are reprogrammable chips that store network authentication data (e.g., IMSI, ICCID) digitally, enabling seamless connections to mobile networks. Per GSMA, eSIMs are now standard in flagship smartphones, tablets, smartwatches, and laptops.

eSIM Card Key Features Include:

• Built-in Chip: An eSIM is directly integrated into your mobile device’s motherboard; thus, no more SIM card swapping.

• Multiple Profiles: Store and switch between plans (e.g., personal, work, travel) via settings.

• Remote Activation: Activate plans without store visits, using eSIM QR codes or apps.

Supported by devices like the iPhone 15, Samsung Galaxy S24, and Google Pixel 8, eSIMs are driving a digital connectivity revolution. Thinking, is my phone eSIM compatible? You can find the eSIM-supported phones list here.

At SimCorner, we’ve got plenty of eSIM plans to make your travels simple and hassle-free. With coverage in over 200 destinations worldwide, including popular locations in Europe, Asia, Africa, and more, you’ll stay connected no matter where you go.

How Does an eSIM Work?

An eSIM connects your device to a mobile network using a digital profile, eliminating the need for a physical SIM card. Here's a closer look at how do eSIMs work for travel:

1. Embedded Chip: The eSIM is a small chip integrated into the device’s motherboard, capable of storing multiple carrier profiles.

2. Profile Download: Users receive a QR code or activation code from a carrier or eSIM provider. Scanning the QR code or manually entering the activation code installs the carrier’s profile directly onto your device’s eSIM.

3. Network Authentication: Once the profile is downloaded, it verifies your device with the selected mobile network—activating access to calls, texts, and data services.

4. Remote Management: Carriers can update or modify profiles over-the-air (OTA), allowing seamless plan changes or network switches without physical intervention.

This digital approach makes eSIM cards highly flexible, as you can store multiple profiles (e.g., personal, work, or travel plans) and toggle between them as needed. eSIMs can also store Wi-Fi credentials and loyalty program data, offering functionality beyond mobile connectivity. This digital setup streamlines activation and adds flexibility, making it especially useful for travellers.

How Do eSIMs Work for Travel?

eSIMs are a traveller’s best friend in 2025, simplifying connectivity across borders. Here’s how eSIM cards enhance the travel experience:

• Regional and Global Plans: You can purchase an eSIM for international travel from a renowned provider like SimCorner, which offers flexible data packages for specific countries (e.g., Japan, the UK, New Zealand) or regions (e.g., Europe, Asia, Africa).

• Instant Activation: Plans are activated by scanning an eSIM QR code before departure, ensuring on-the-spot connectivity upon arrival.

• Multi-Country Coverage: Many eSIM cards offer multi-country coverage, eliminating the need to purchase a different one at each destination.

• Cost Savings: eSIM plans are typically more affordable than traditional roaming charges. For example, a 5GB plan for Europe might cost $10–$20, compared to $10/GB for roaming.

• Dual-Line Support: You can keep your home number active for calls/texts abroad while using an eSIM card for data-only service, ideal for staying connected affordably.

How Does eSIM Work for International Travel?

International travel with eSIM cards is seamless and efficient. Here’s a closer look:

• Pre-Trip Setup: Purchase an eSIM for international travel online from popular providers like SimCorner, which offer data plans for over 200+ countries. Select a plan from the all SIM & eSIM card collections based on your travel duration and data needs.

• Flexible Options: Choose data-only eSIM plans to continue using social media apps like WhatsApp, YouTube, and Google Maps or opt for full-service plans that include international calls and texts.

• Cross-Border Convenience: Regional eSIMs (e.g., EU-wide plans) enable uninterrupted connectivity across multiple countries within the same continent.

• Real-Time Management: Using the SimCorner App, you can manage data usage or top up your specific eSIM card (if rechargeable) without physical SIM swaps.

Benefits of eSIM Cards

As discussed, eSIMs for international travel are quickly becoming the future of connectivity, offering a level of convenience and flexibility that traditional physical SIM cards can’t match. With eSIM cards, you get all the benefits of a regular travel SIM card—plus a few extra perks that make managing your mobile connections a whole lot easier.

eSIMs outperform traditional SIMs in several ways, as outlined in the table below—no wonder they’re leading the way in 2025.

eSIM cards also enable dual-SIM functionality, perfect for separating personal and work lines. However, eSIMs have limitations, such as limited support in budget devices and potential carrier lock-in issues, which you should consider.

Is My Phone eSIM Compatible?

Thinking, how does eSIM work on Android or iOS? eSIM compatibility is becoming common in newer smartphones, tablets, and smartwatches. According to Apple support, iPhones purchased in the United States from iPhone 14 onwards are eSIM-only models. Check how to get an eSIM or the activation process below.

• Here’s a brief on how do eSIMs work on Android: Go to Settings > Network & Internet or a similar menu where SIM card information is displayed.

• Here’s a brief on how does eSIM work on iPhones: Navigate to Settings > Cellular > Add eSIM. If the option to add or manage eSIM card profiles is present, the device likely supports this functionality.

To use an eSIM for international travel, your device must support the technology. Here’s how to check:

• Phone Specifications: Check your device’s manual or the manufacturer’s website. Most flagship devices since 2020 (e.g., iPhone 11+, Samsung Galaxy S20+, Google Pixel 4+) support eSIM cards.

• Settings Check:

• iOS: Go to Settings > Cellular (or Mobile Data) and look for “Add Cellular Plan” or “Add eSIM.”

• Android: Navigate to Settings > Network & Internet > Mobile Network and check for eSIM options.

• Carrier Support: Verify that your carrier offers eSIM plans and 24/7 customer support.

• Unlocked Devices: Unlocked phones provide maximum flexibility, unlike carrier-locked ones that may limit eSIM compatibility.

If your device lacks eSIM support, you can still use physical travel SIM cards or portable Wi-Fi devices for connectivity.

eSIM QR Code: A Wireless Key to Instant Activation

One tap and one scan—is all it takes to activate an eSIM for international travel. Let’s dig deeper:

• How it Works: When you purchase an eSIM card online, the provider sends a unique QR code via email or app. Scan the eSIM QR code with your device’s camera, follow simple instructions, and go online in minutes.

• Security: QR codes or eSIM downloads are typically single-use and device-specific, ensuring secure activation for all users.

• Alternative Methods: Some providers offer mandatory activation via apps or manual OTPs if eSIM QR code scanning isn’t feasible.

• Storage Tip: Save the QR code (e.g., as a screenshot) for your future reference, but avoid sharing it to prevent unauthorised access.

For example, SimCorner’s QR code system lets you activate all eSIM plans within a few minutes, with clear instructions provided during purchase.

How Does eSIM Work on Android?

eSIM card functionality on Android devices is straightforward but differs slightly based on the manufacturer:

1. Check Compatibility: Ensure your device supports eSIM (e.g., Google Pixel 5+, Samsung Galaxy S21+, or newer models from Oppo, Xiaomi, or Huawei).

2. Access Settings: Go to Settings > Network & Internet > Mobile Network and select “Add Carrier” or “Mobile Plan.”

3. Scan eSIM QR Code: Use the provided QR code to download and activate your profile.

4. Manage Profiles: Toggle between multiple profiles or set a default for calls, texts, and data via the settings menu.

5. Dual SIM Support: Many Android devices support a physical SIM alongside an eSIM card to keep two phone numbers active simultaneously.

Need multiple numbers on one device? Android handles it seamlessly—whether it’s a travel eSIM or your main SIM back home.

How to Get an eSIM?

As mentioned, getting an eSIM for international travel is simple and entirely digital—no need to visit a store or handle a physical card. Most providers offer instant activation through an eSIM QR code or an app. Here’s what the process looks like, step by step.

1. Verify Compatibility: Confirm your device supports an eSIM card (check settings or specs).

2. Choose a Provider: Options include:

• Carriers: Major carriers like T-Mobile, Vodafone, or AT&T offer eSIM plans.

• eSIM Marketplaces: Make your purchase from a trusted international eSIM provider like SimCorner.

3. Purchase a Plan: Select a plan based on your travel needs (e.g., data-only or full-service for daily use).

4. Activate via QR Code: Scan your unique eSIM QR code provided by your chosen operator to activate the profile on your device.

5. Manage Profiles: Configure the eSIM card as your primary or secondary line and manage profiles within your device settings.

Challenges and Considerations

If you're considering switching to an eSIM for international travel, there are a few things you’ll want to keep in mind. From ensuring your device is compatible to checking if your carrier supports it, there are a couple of bumps in the road you might hit when making the switch.

Let’s take a look at some of the key considerations and potential roadblocks about an eSIM card:

• Compatibility and Device Requirements

As of 2025, not all 5G devices support eSIM technology. eSIMs are generally supported on newer smartphones, including the iPhone XS and later, Samsung Galaxy models, and Google Pixel phones.

If you’re using an older phone, you might not be able to use an eSIM card, so it’s important to double-check your device's compatibility before making the jump.

• Limited eSIM Carrier Availability

While eSIM technology is growing fast, not every carrier offers eSIM support, especially in certain regions abroad. Some areas might have limited options for eSIM-compatible networks, so it’s worth checking if your preferred carrier supports eSIMs before you plan to switch.

Despite these considerations, eSIM cards are still a game-changer for many users, especially frequent travellers. Just be sure to do a little research first to ensure it’s the right fit for you!

That’s everything you need to know about what is an eSIM card and how do eSIMs work. Feel convinced and ready to grab one for your phone? Stick around as we wrap things up with some final thoughts.

Choosing eSIMs in 2025

SimCorner eSIM Cards are ideal if you:

• Travel frequently and need affordable, flexible plans.

• Own a modern device with eSIM support.

• Value digital convenience and eco-conscious solutions.

• Need multiple lines for personal, work, or travel purposes.

Stick with SimCorner Travel SIM Cards if you:

• Use older or budget devices without eSIM support.

• Prefer physical control over your connectivity.

• Live in areas with limited eSIM carrier support.

The Big Picture: Join the eSIM Revolution

With 2025 on the horizon, eSIM technology is transforming mobile connectivity, offering unparalleled convenience, security, and travel-friendly features. From instant activation via QR codes to multi-profile support and reduced environmental impact, eSIMs cater to modern lifestyles. Whether you're exploring international destinations, managing multiple lines, or simply seeking a more streamlined mobile experience, eSIM cards provide a future-proof solution.

What does it all mean? SimCorner’s eSIM plans make international travel even simpler with its app. No more swapping physical SIM cards or searching for local carriers. When you’re exploring new destinations or managing work and personal lines on a business trip, the SimCorner app ensures you seamlessly manage your data usage wherever you go!

Upgrade your mobile experience to be smarter, easier, and more efficient with SimCorner!