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The Samsung Galaxy S21 has eSim functionality

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The Samsung Galaxy S21 has eSim functionality

 

but it is only active in theory. Samsung was convinced to allow eSim on this model after Google and Amazon pleaded with carriers to allow it. eSim allows users to activate mobile network plans in the phone without a physical SIM card. However

See also 

The Dual SIM Apple Watch is compatible with smartphones that support dual-SIM. To use this device