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Yes, all the models of Samsung Galaxy S23 series (S23, S23+, S23 Ultra) are equipped with an eSIM.
All Samsung Galaxy S23 models support using one eSIM and one physical SIM simultaneously. However, like previous generations, eSIM support might vary depending on your region and carrier.
To activate your eSIM, you need a wireless service carrier which provides you an eSIM profile and data plans. eSIM data plans availability may vary depending on country and carrier. Gigago is one of the eSIM carriers that support eSIM for the Samsung Galaxy S23 series, in about 200+ destinations, on the 5 continents.