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Yes, all the models from Samsung Galaxy S20 series (S20, S20+ 5G, S20 Ultra, S20 Ultra 5G, S20 FE 5G) are equipped with an eSIM, but with some variations depending on the specific model and region.
Thanks to the development of eSIM technology, the Samsung Galaxy S20, S20+, and S20 Ultra generally support dual SIM usage (one eSIM and one physical nano-SIM).
To activate your eSIM, you need a wireless service carrier which provides you an eSIM profile and data plans. Gigago is one of the eSIM carriers that support eSIM for the Samsung Galaxy S21 series, in about 200+ destinations, on the 5 continents.