Don't buy a Cellular Apple Watch and use it with AT&T. You are told it will add $10+tax per month. It costs $100 for the cellular option on the watch AND THEN it changes your plan to multi-line. This adds $35 per month on top of the $10 per month for the watch plan. So you pay an EXTRA $45 per month PLUS tax. This doesn't include activation fees and all the other crap they add. AT&T tell me it's the same on Verizon etc.