What is eSIM? How does eSIM work?

An eSIM, or embedded SIM, is a virtual version of the traditional physical SIM card. It's a small chip built directly into your device, eliminating the need for a removable card. Think of it as a digital SIM card that's programmable and rewritable. 

Instead of physically inserting a SIM card, you can download and store multiple carrier profiles on your eSIM-enabled device. This technology allows you to switch between different mobile networks or plans without changing physical cards. 

eSIMs offer greater flexibility, especially for travelers, as you can easily use local networks when visiting other countries. They also save space in devices, enabling slimmer designs or room for other components. As more carriers and device manufacturers adopt eSIM technology, it's becoming an increasingly popular alternative to traditional SIM cards.

How does eSIM work?

eSIM works by storing carrier profiles digitally within a device's embedded chip. When a user wants to activate a new plan or switch carriers, they simply scan a QR code or use an app provided by the carrier. This process downloads and installs the necessary profile onto the eSIM. The device then communicates with the carrier's network using this digital profile, just as it would with a physical SIM card. 

Multiple profiles can be stored on a single eSIM, though typically only one can be active at a time. Users can easily switch between these profiles through their device settings. The eSIM also receives over-the-air updates, allowing carriers to push new features or make adjustments without requiring physical changes to the device.

How does eSIM work for travel?

Roamless eSIM works differently. It does not have fixed plans that you buy for each country. Instead, it has a ‘pay-as-you-go model’ where you put funds in your wallet and use that for mobile internet & call time whichever country you go. Your funds never expire, you pay only what you use which gives you more freedom compared to other eSIM services during your international travels.

If you are looking to find out your travel internet needs, you can read our how much data do I need for travel abroad guide.

Comparing eSIM vs Physical SIM cards

eSIMs offer several advantages over traditional physical SIM cards. Firstly, eSIMs eliminate the need for a physical card slot, allowing for more compact device designs and potentially larger batteries. They also provide greater flexibility, enabling users to switch carriers or plans without physically changing SIM cards. This is particularly beneficial for international travelers who can easily adopt local plans. eSIMs can store multiple profiles, making it convenient for those who use separate numbers for personal and business purposes. Additionally, the activation process for eSIMs is often quicker and can be done remotely, saving time and reducing plastic waste. However, physical SIM cards are still more widely supported and may be preferred in regions with limited eSIM adoption. They also allow for easier transfer between devices that may not support eSIM technology. Read our guide on eSIM vs Physical SIM cards to learn if there is a difference on the signal strength and speed between the two. You can also check our post on Can I use eSIM and Physical SIM at the same time? for using both technologies together.

Benefits of eSIM for Travelers

Roamless eSIM offers significant advantages for travelers, making international travels more convenient and cost-effective. Here are the key benefits:

• Flexibility: Easy to top up as needed, without long-term commitments, your funds never expire, you pay as you use,

• Pay-as-you-go: Users can use their funds in their wallets for any country they are in, which makes it more convenient for those who will visit multiple countries,

• Wide coverage: You can use your funds in 167 countries,

• Compatibility: Works on eSIM compatible smart phones, tablets, laptops or as a hotspot for other devices,

• No Speed Limits: Roamless eSIM does not throttle or limit your internet speed like some other eSIM providers,

• Instant activation: Travelers can set up their eSIM before departure or upon arrival, without needing to visit any physical stores,

• No physical SIM needed: Eliminates the risk of losing small SIM cards or dealing with different SIM sizes,

• Dual SIM functionality: Allows keeping your home number active while using a local data plan abroad,

• Cost savings: Often provides more competitive rates than traditional roaming services,

• Eco-friendly: Reduces plastic waste from disposable SIM cards.

These features make Roamless eSIM an attractive option for frequent travelers, digital nomads, and anyone looking for hassle-free mobile connectivity while abroad.

Can you transfer SIM cards to eSIM cards?

Yes, in many cases, you can transfer a physical SIM card to an eSIM. Here's a brief explanation:

• Check compatibility: Ensure your device and carrier support eSIM technology.

• Contact your carrier: Request an eSIM transfer from your service provider.

• Obtain QR code: Your carrier will provide a QR code or activation details.

• Scan and activate: Use your device's settings to scan the QR code and activate the eSIM.

• Confirm transfer: Once activated, your physical SIM's data and number will be transferred to the eSIM.

Note that not all carriers or devices support this process, and the exact steps may vary depending on your location and service provider.

Can I transfer an eSIM from one phone to another?

Yes, eSIM can be transferred from one phone to another as long as both devices support eSIM technology. The process typically involves deactivating the eSIM profile from the original device and then re-activating it on the new device, following the specific instructions provided by the mobile network operator

How many eSIMs can be used in a phone?

The number of eSIMs a phone can use depends on the device's capabilities:

• Most eSIM-enabled phones support at least one eSIM alongside a physical SIM card.

• Some newer models, like recent iPhones, can store multiple eSIM profiles (up to 8 or more).

• However, typically only one or two eSIMs can be active simultaneously.

• The exact number varies by phone model and manufacturer.

Always check your specific device's specifications to determine its eSIM capacity and limitations.

You can also read our how activate eSIM on iPhone, how to activate eSIM on Android, is iPhone 16 eSIM only? blog posts.

eSIM Travel Trends

eSIM technology has gained significant traction among international travelers, offering convenience and cost-effective connectivity solutions. According to a report by Juniper Research, the number of eSIM-enabled devices is expected to reach 3.4 billion by 2025, up from 1.2 billion in 2021[1]. This growth is partly driven by the travel sector, where eSIMs provide seamless access to local networks without the need for physical SIM swaps. 

A study by Kaleido Intelligence forecasts that the eSIM market for consumer devices will grow at a CAGR of 22% between 2020 and 2025, with travel-related eSIM activations expected to surge by 300% by 2024[2]. 

The technology's appeal lies in its flexibility, allowing users to switch between local data plans easily and avoid expensive roaming charges. Furthermore, a report by ABI Research predicts that by 2025, 60% of smartphones shipped globally will support eSIM technology[3], indicating a growing global infrastructure to support travelers' connectivity needs.

[1] Juniper Research. (2021). "eSIM: Market Outlook 2021-2025"

[2] Kaleido Intelligence. (2020). "eSIM in Consumer Devices: Trends, Forecasts & Strategies 2020-2025"

[3] ABI Research. (2020). "eSIM and iSIM: Connectivity Game-Changers for M2M and Consumer Markets"