I've got an s21 and ordered a version 3 but I keep hearing some janky stuff about the 2 so my hopes are slowly dying that I made a good purchase... truth be told.
Thank you for reaching out. The Samsung Gear 2 watch will only support Android versions prior to Android 5. The first watch to support Android 5.0 and above is the Galaxy Watch 42mm and 44mm. https://www.samsung.com/us/support/answer/ANS00082502/
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I got an active 2, 44mm watch with my s21 ultra order. It works great with my s2q ultra. It goes through Bluetooth. No wifi necessary or data plan. I love it!! It's definitely water proof too. 😊