How to activate my watch to my iPhone lets get started
Activate my health and fitness watch to iPhone
iPhone 6s Plus, 15
Did you buy a new watch? If you bought it from Apple, it would come with WatchOS 9, which would not be compatible with an iPhone 6s, if that is what you own.
So let's make sure you have a watch which is compatible.
What iPhone do you own? What watch do you own?