<P> Apple Watch relies on a wirelessly connected iPhone to perform many of its default functions such as calling and texting . Series 3 LTE Apple Watches are able to be used without needing to be consistently connected to an iPhone, though an iPhone is still required to set up the device . Most Apple Watches that are currently produced require an iPhone 5s or later with iOS 11; the Series 3 LTE model requires an iPhone 6 or later with iOS 11 . </P> <P> The Apple Watch was released on April 24, 2015 and quickly became the best - selling wearable device with 4.2 million sold in the second quarter of the 2015 fiscal year . </P> <P> The second generation of Apple Watches were released in two tiers in September 2016: the Apple Watch Series 1 and Apple Watch Series 2, while the first generation was discontinued . </P> <P> The Apple Watch Series 3 was released on September 22, 2017 alongside the discontinuation of the Apple Watch Series 2 . Apple still produces the second - generation Series 1 Apple Watch as an entry - level device . </P>

When was the apple watch series 2 released