Use Apple Watch without its paired iPhone
Although you need your iPhone nearby to do many things with Apple Watch, there are things you can do when you don’t have your iPhone with you or when it’s turned off:
Play music from a synced playlist on Apple Watch
Use the watch , alarms , timers , and the stopwatch
Track your activity with the Activity app
Track workouts using the Workout app
Display photos from synced photo albums in the Photos app
Apple Watch uses Bluetooth® wireless technology to connect to its paired iPhone and uses the iPhone for many wireless functions. Apple Watch can’t configure Wi-Fi networks on its own, but it can connect to Wi-Fi networks you’ve set up or connected to using the paired iPhone.
If your Apple Watch is in range of a Wi-Fi network that iPhone has connected to before, you can still do the following (even if iPhone is turned off):
Send and receive Digital Touch messages
Send and receive messages using iMessage
Make and receive phone calls (if you have Wi-Fi calling enabled and you’re within range of a Wi-Fi network that your iPhone has connected to before).