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Embedded SIM

An alternative to physical, removable SIM cards that instead embeds SIM functionality into the phone hardware.

See: SIM

Instead of swapping physical cards to associate a phone with a different account (and phone number), the change is made in software over the network.

eSIM uses far less physical space inside a phone than a SIM card slot, and enables cellular functionality in devices too small to accommodate physical SIM cards, such as smartwatches.

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