Can I update my watch from my phone?
Update your Apple Watch using your iPhone At the end of the day, leave your Apple Watch and iPhone charging overnight so the update can complete. Or you can update your Apple Watch with your iPhone manually: On your iPhone, open the Apple Watch app, then tap the My Watch tab. Tap General, then tap Software Update. On your watch, open the Settings app. Tap General, then tap Software Update. Tap Install if a software update is available, then follow the onscreen instructions.