Apple Watch series 5
Can I use the data from my o2 iPhone on an Apple Watch series 5? I’m not sure why I have to purchase data with the Apple Watch?
Apple Watch Series 5 (GPS + Cellular) can be used without enabling the built-in cellular feature, in which case it functions like a GPS-only model and can be used in conjunction with a service plan for iPhone from any carrier, with no need to activate the watch's cellular function on the plan.
ASC - Late 2012 Mac mini, macOS 10.14.6; Watch, series 5 GPS/cellular, watchOS 6.2; iPad Air 2, ipadOS 13.6.1; iPhone 8+, iOS 13.6.1; TV 4th Gen, tvOS 13.4.8; HomePods, audioOS 13.4.8 and Airport Express w/ Airplay 2