https://www.theverge.com/2017/9/9/16281460/apple-watch-firmware-leak-lte-connectivity-rumor

There has been a series of revelations about the next iPhone that Apple is expected to unveil next week, and a new leak of iOS 11’s Golden Master helps confirm some rumors that the next iteration of the Apple Watch will have LTE connectivity.

The revelation doesn’t come as a huge surprise: there’s been reports that the wearable will come with built-in LTE this year. It’s also rumored that Apple will release two versions: one with LTE and one without. If true, the LTE-enabled device wouldn’t need to be tethered to and be in close proximity to one’s iPhone in order to make calls.