eSIMs explained: What they are, and how you can set one up

eSIM: The Future of Mobile Connectivity

Smartphones have traditionally relied on physical SIM cards for network connection. However, the rise of eSIM (embedded SIM) technology is changing this. eSIMs store user information on a chip within the phone itself, eliminating the need for a swappable physical card. This offers several advantages, including faster and more convenient number switching, without significantly altering the user experience. While physical SIMs still exist, eSIMs represent the future of mobile connectivity.

How eSIMs Work

The transition from physical SIM to eSIM is less drastic than it might seem. Both utilize integrated circuits; the difference lies in the location and programmability. eSIMs use a reprogrammable integrated circuit within the phone, retrieving necessary information (phone number, identity, data plan) directly from the internet, rather than from a physical card. Functionality remains the same: making/receiving calls, sending/receiving texts, and accessing data when not connected to Wi-Fi. After initial setup, there's little noticeable difference in user experience.

The key benefit is the ability to quickly set up or change numbers without waiting for physical card delivery. This is particularly useful for travelers who can easily activate a local eSIM online. Many phones support multiple eSIMs, allowing users to manage several numbers simultaneously. Furthermore, there's no need for a SIM ejector tool, simplifying the process of managing multiple accounts.

Despite the advantages, physical SIMs will likely persist for some time due to varying user habits and regional requirements. However, the long-term trend points towards eSIM adoption, not only in smartphones but also in other devices like tablets and laptops. Eliminating the SIM card slot allows for smaller, more compact devices with increased storage or larger batteries.

Setting Up an eSIM

eSIM configuration options appear during initial phone setup, allowing for adding a new eSIM or transferring one from another device. If purchased with a carrier plan, setup usually involves a few simple confirmation steps.

Switching numbers from another phone or setting up an eSIM on a separately purchased phone requires slightly more steps. The carrier provides detailed instructions, typically involving an activation code for verification.

On iPhones, navigate to Settings > Cellular > Add Cellular Plan to configure an eSIM. The Add eSIM option (for additional eSIMs – up to eight) initiates the same process. Older models with physical SIMs may offer a Convert to eSIM option.

Android devices generally offer broader eSIM support and more flexible software settings. For example, the Google Pixel 9 supports both a physical SIM and one or two eSIMs. Configuration involves going to Settings > Network & internet > SIMs > Add SIM > Set up an eSIM, following the instructions to enter an activation code or scan a QR code.

Transferring a number from an old phone to a new one via eSIM isn't as instantaneous as with physical SIMs. Consult your carrier for specific instructions; typically, this involves a few clicks on their website to initiate the transfer. Then, set up the eSIM on the new phone as described above.

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