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https://support.microsoft.com/en-us/windows/use-an-esim-to-get-a-cellular-data...

An eSIM lets you connect to the Internet over a cellular data connection. With an eSIM, you don't need to get a SIM card from your mobile operator, and you can quickly switch between mobile operators and data plans. For example, you might have one cellular data plan for work, and a different plan with another mobile operator for personal use.

https://docs.microsoft.com/en-us/uwp/api/windows.networking.networkoperators.esim

A class that represents an embedded SIM (eSIM, or eUICC). An eSIM stores one or more identities (eSIM profiles) belonging to one or more mobile network operators (MNOs). An eSIM is not a form factor; it's a way to manage SIM profiles.

https://answers.microsoft.com/en-us/windows/forum/windows_10-hardware/what-is-a-esim/5...

Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.

https://docs.microsoft.com/en-us/windows/client-management/mdm/esim-enterprise-management

The eSIM Profile Management Solution puts the Mobile Device Management (MDM) Provider in the front and center. The whole idea is to use an already existing solution that customers are familiar with and that they use to manage devices.