Watch series 3 - Will health app count my steps if I have only cellular watch with me

Hi

Yes - once it has been set up, the Activity app on Apple Watch tracks your steps automatically in the background, both during general daily wear and during workouts and regardless of whether your Apple Watch is connected to your iPhone, to Wi-Fi or, for Series 3 (GPS + Cellular) models to a cellular network:

Use the Activity app on your Apple Watch - Apple Support

Your daily steps total can be viewed:

• Via the Activity app on your watch:

  Open the app and scroll to the bottom of the screen.

• Via the Activity app on your iPhone:

  Select to view a day's results, then scroll to the bottom to see Steps and Distance.

• Via the Health app on your iPhone:
  • Go to Health Data > Activity > Steps.
  • Adding Steps to Favourites adds it to top section of the Today screen (accessed via the Today tab) and the Favourites section within the Activity category.
  • Use the Health app on your iPhone or iPod touch - Apple Support

More information:

Track workouts and stay healthy with Apple Watch - Apple Support

Use the Activity app on your Apple Watch - Apple Support

Work out with your Apple Watch - Apple Support

Yes, they will.

The Heath app on your iPhone combines health and fitness data - including steps - from Apple Watch, iPhone and any other sources that share data to the app.

When doing so, it automatically adjusts the reported results to avoid any double-counting of the same type of data for the same period from different sources.

More information:

Use the Activity app on your Apple Watch - Apple Support

Use the Health app on your iPhone or iPod touch - Apple Support