How eSIMs Work: The Technology Explained Simply

An eSIM does the same core job as a plastic SIM: it identifies you to a mobile network. The difference is that it is a reprogrammable chip already inside your phone.

The profile

When you buy a plan, you download a small file called a profile onto the eSIM chip. The QR code you scan simply tells your phone where to fetch that profile.

Connecting to a network

Once installed, the profile lets your phone authenticate with a carrier — locally or abroad — and start using data, just like a normal SIM.

Multiple profiles

Your eSIM can store several profiles, so you can keep plans for different countries and switch between them in settings without any physical swapping.

Think of the eSIM as the hardware and the profile as the software you load onto it.

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