A:Answer To use the cellular capabilities of an Apple Watch, you need to add it to your existing wireless account. During the initial setup of the Apple Watch, there is a step that guides you through adding the Watch to your cell phone account. On Verizon, for example, an Apple Watch shares the same phone number as your cell phone and costs an additional $10 per month. No matter which carrier you have, your phone and Watch must be on the same carrier.