A:Answer If you want cellular connectivity on this smartwatch then you will need to get the AT&T version. You would have to add the watch to your AT&T plan if you already have one.
Otherwise, you will have to establish an AT&T plan. The alternative is to have the AT&T version without any plan or smartphone, and it will operate as just a smartwatch without any of the features that require connectivity (TEXT, EMail, Calls...). (I think setup may require a connection of some kind though.)