If you're looking for a smartwatch for with your iPhone, you might think you need an Apple Watch. This isn't the case, though. Other brands also work together well with an iPhone, like Garmin, Polar, Huawei, or Fitbit. An Apple Watch works together with your iPhone seamlessly. You'll get extra functions, like controlling the camera via your watch. Which smartwatch suits you best, depends on what you want to do with it.