How to enable LTE cellular service on your Apple Watch

Photo by Vjeran Pavic / The Verge If you want to leave your iPhone at home without missing out on iMessages, calls, and other notifications, now you can — if you have the right Apple Watch. Specific Apple Watch models are able to connect via 4G LTE, enabling you to go on a run or an errand without needing to carry your phone.
So far, three models of the Apple Watch support this feature:
Apple Watch Series 3 (GPS + LTE)
Apple Watch Series 4 (GPS + LTE)
Apple Watch Series 5 (GPS + LTE)These