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eSIM

A SIM whose operator profile can be downloaded and changed remotely, usually soldered into the device.

With eSIM, the operator profile is software on a secure chip (the eUICC). New profiles can be downloaded over the air, so a device can change operator without a site visit.

Why it matters for business

eSIM reduces lock-in and logistics for devices that stay in the field for years or are sold in many countries. It adds some setup complexity and relies on operators supporting the right standards.