Is the apple watch series 4 compatible with the iPhone 5?
Is the apple watch series 4 able to be paired with the iPhone 5?
iPhone 8, iOS 13
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There are two types of Apple Watch Series 4 relevant to your question: Apple Watch Series 4 (GPS + Cellular) requires an iPhone 6 or later with iOS 12 or later. Apple Watch Series 4 (GPS) requires an iPhone 5s or later with iOS 12 or later. So, no, iPhone 5 falls just short of what's required for the GPS version of the Series 4.
-- JDee