Own more than one Apple Watch? New iOS 9.3 feature will allow you to pair them all on one iPhone
With the betas for iOS 9.3 and watchOS 2.2, users can pair more than one of their Apple Watches to one iPhone
Each Apple Watch listed will include an image of the timepiece including the style, color and watch face employed by the user. Auto-Switch will help developers test apps they are writing to make sure that they are compatible for both the 38mm and 42mm versions of the timepiece
Apple is also hoping that by allowing multiple Apple Watch units to pair with a single iPhone, fans of the wearable might purchase additional watches to wear. For example, someone who parties with wealthy executives, athletes or celebrities might wear a lower priced Apple Watch Sport model during the day, but put an Apple Watch Edition on his/her wrist for those fabulous formal evening get-togethers.
source: AppleInsider
Things that are NOT allowed: