$350 at AT&T store with Sim card which means its own phone number

Also, this watch has phone number and I will loose my phone couple of weeks.

at least 2 or 3 different versions of the Gear S2.Mine is the standalone capable model with its own phone number

Apparently the watch interfaces with the cellular system, so you need to buy another phone number.

I was told by Verizon once I received the watch to contact Verizon sales for them to assign the watch a seperate phone number.

Dislike proprietary O/S as lack of apps and you have to stick with stock/samsung apps to get all the features.

Samsung's proprietary O/S gets you nothing but battery life maybe which has shrunk from 2 full days to 1 3/4 in 4 months