Check apple.com/uk/watch/cellular for participating wireless carriers and eligibility. Apple Watch Series 3 (GPS + Cellular) requires an iPhone 6 or later with iOS 11 or later.
¹Apple Watch and iPhone service provider must be the same. Not available with all service providers. Roaming is not available outside your provider network coverage area. Wireless service plan required for cellular service. Contact your service provider for more details.
²Compared with the previous generation.
³ISO standard 22810:2010. Appropriate for shallow-water activities like swimming. Submersion below shallow depth and high-velocity water activities not recommended.