T-Mobile offers three months of service free with the purchase of an Apple Watch Series 3 when you sync your telephone number. Plus, free shipping applies. After three months, you'll be billed $10 per month via AutoPay automatically unless you call 611 to cancel.

The newest version of Apple's smartwatch features built-in cellular, to allow for phone calls without the need to pair with your phone, as well as a new W2 dual-core processor that enables Siri to talk on your watch. It also has an altimeter and remains the same size as the Series 2.