Hi
It is not normally necessary to re-pair your watch when it becomes disconnected from your iPhone.
If your watch does become disconnected from your iPhone via Bluetooth, it will attempt to connect with a known Wi-Fi network as a fallback.
To check the connection status of your watch at any time, go to the Settings Glance:
- When viewing the time on your watch, swipe up on the display, then swipe left / right to the Settings Glance.
- This will state either Connected or Disconnected:
- If it states Connected and the icon at the upper-right corner is a green phone, then your watch is connected to your iPhone via Bluetooth.
- If it states Connected and the icon is a green cloud, then your watch is disconnected from your iPhone via Bluetooth, but has instead connected (as a fallback) to a known Wi-Fi network.
- If it states Disconnected, your watch is disconnected from your iPhone and also is not connected to a Wi-Fi network. The icon at the upper-right corner will be a red phone with a line through it.
- Under these circumstances, the same Disconnected icon will also be shown at the top of your watch face:

- Swipe down again to return to the watch face.
Bluetooth range is around 33 feet / 10 meters. The actual range will vary in practice, but you do not necessarily need to have your iPhone on or immediately around you for the watch to maintain the Bluetooth connection.
Disconnections can be normal, happening whenever the watch loses the Bluetooth connection with the paired iPhone and no known W-Fi network is available.
Note that there is a difference between your devices being "unpaired" vs them becoming temporarily "disconnected". Once they have been paired, your watch and iPhone will remain paired until they are manually unpaired. However, they can become disconnected or connected (multiple times) whilst still remaining paired.