https://www.theverge.com/2017/9/12/16270442/new-apple-watch-lte-announced-price-release-date-features

Apple announced its Apple Watch Series 3 today, the first to include LTE-compatibility. This means that you can now stream music and make phone calls without your phone in tow.

Jeff Williams, Apple’s chief operating officer, called it "the ultimate expression of Apple Watch." Aside from the LTE watch, Apple CEO Tim Cook also declared the Apple Watch the "number one watch in the world" (likely in terms of revenue), beating out Rolex, Fossil, and Omega. Cook also said the device experienced 50 percent year-over-year growth, though Apple was characteristically cagey about sharing unit sales numbers.