why won't my apple watch series 3 not connecting to my iphone 6s plus?
why won't my apple watch series 3 not connecting to my iphone 6s plus?
Apple Watch Series 3, watchOS 6
Are you sure it's an iPhone 6s and not an iPhone 6? Apple Watch Series 3 requires an iPhone 6s. Check here: https://support.apple.com/en-us/HT201296
If you do have an iPhone 6s, ensure it is updated to iOS 13 or later. See here for instructions: https://support.apple.com/en-us/HT204204