Apple Embedded Sim Card Works with all carriers except Verizon (See explanation below under product description).
Silver Aluminum Chassis with Ion-X Glass, Fog Sport Band, 16GB of Storage
1.3 Inch (340 x 272) Display, Changeable Faces with Widgets, Integrated GPS & 4G LTE Connectivity
Water-Resistant to 164 feet (50 meters), Displays Notifications and Runs Apps, Heart rate sensor
Up to 18 hours of battery life, Apple Watch Series 3 38mm (GPS + Cellular) requires an iPhone 6 or later with iOS 11 or later. Apple Watch and iPhone service provider must be the same.