A:AnswerApple Watches sold in the US are configured for North America cellular band usage. The watch has an SIM embedded in it; there is no slot to swap out the SIM.
A:AnswerPut item in your shopping cart, then go to complete order. Your zip code should be entered to calculate the taxes on your purchase. You could also do that math yourself. For example, 7% sales tax is really 0.07. So multiply your total purchase by your actual sales tax rate in decimal form and you have your answer.