Some bands are sold separately. Apple Watch Series 3 (GPS + Cellular) requires an iPhone 6 or later with iOS 12 or later. Wireless service plan required for cellular service. Apple Watch and iPhone service provider must be the same. Not all service providers support enterprise accounts; check with your employer and service provider. Roaming is not available outside your carrier network coverage area. Contact your service provider for more details. Check www.apple.com/watch/cellular for participating wireless carriers and eligibility.