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The Apple Watch Series 3 is the third-generation model of the Apple Watch. It was released on September 22, 2017.
The main feature is the new built-in LTE cellular connectivity; offering voice and data communication and Apple Music streaming. The watch comes with an electronic SIM card and shares the same mobile number as the user’s iPhone. Add-on plans start at $10/month from the four major US carriers.
Apple Watch Series 3 has a dual-core Apple S3 processor (which is 70% faster than the Apple S2). The cellular-capable watch has a red digital crown while the non-LTE version has a plain digital crown. It has a built-in NFC chip which can be used for Apple Pay. Apple claims 18 hours of battery life.
The Apple Watch Series 3 ships with watchOS 4, it has an updated Heart Rate app (including resting and recovery period monitoring), Workout app (with High Intensity Interval Training), as well as two-way data synchronization with GymKit-integrated cardio fitness equipment from companies such as Life Fitness, Technogym, Cybex, Schwinn, MS Artrix, Stair Master and Star Trac.
The Apple Watch Series 3 (GPS) requires an iPhone 5s or later with iOS 11 or later. The Apple Watch Series 3 (GPS + Cellular) requires an iPhone 6 or later with iOS 11 or later.