1. Apple Watch Series 3 (GPS) requires an iPhone 5s or later with iOS 11 or later.
2. Apple Music requires a subscription. 
3. Apple Watch Series 3 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 ocean. However, Apple Watch Series 3 should not be used for scuba diving, waterskiing, or other activities involving high-velocity water or submersion below shallow depth. 
Selection may vary. Some straps are sold separately.
Some features may not be available in all countries or regions.
AirPods are sold separately.