What's stored on that tiny SIM card in your phone, and why is the eSIM gradually replacing it?
A SIM (Subscriber Identity Module) is a small chip that lets your carrier identify you as a subscriber. It stores your IMSI number, an authentication key and some network settings.
How is a physical SIM different from an eSIM?
An eSIM holds the same kind of information, but it's built right into your phone. You simply scan a QR code, with no plastic card to pop in or out. Learn more in What is an eSIM?.
- No risk of losing your primary SIM while traveling.
- Store multiple eSIMs on a single phone.
- Set it up remotely and receive it instantly by email.
