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Apple Watch Series 5 requires an iPhone 6s or later with iOS 13 or later. Carrier plan is required for mobile service. Apple Watch and iPhone service provider must be the same. Not available with all service providers. Not all service providers support corporate or prepaid plans; check with your employer and service provider. Legacy plans may not be compatible. Roaming is not available. Contact your service provider for more details. Check apple.com/au/watch/cellular for participating carriers and eligibility.
Apple Watch Series 5 has a water resistance rating of 50 metres under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or the ocean. However, Apple Watch Series 5 should not be used for scuba diving or waterskiing, or other activities involving high-velocity water or submersion below a shallow depth.