But not after the iPhone was turned off. It can be understood that the iPhone is equivalent to the "repeater" of Apple Watch. When the phone calls in, it will call the iPhone first, and then transfer to the Apple Watch (when the phone detects that the watch is out of Bluetooth range).

Software application:

For sports, Apple Watch has launched two new applications: fitness and exercise. Users can set sports types and targets on Apple Watch, and the watch will record data in real time.

Users will be motivated, and the data monitored by Apple Watch can also be seen on the iPhone. Cook said that Apple Watch will change the way we exercise, such as recording the heartbeat, recording the position with the iPhone's GPS, measuring calorie consumption, exercise time and distance.

The former is used to count the time of users' activities, sports and standing in a day, and it is counted by three circles of red, blue and green. The latter can set training objectives, such as time, distance, calories and other units, which will inevitably have a partial impact on many smart bracelets calling for exercise on the market at present.