Apple Watch Series 4 GPS+Cellular

There is no problem using your Apple Watch LTE without activating the cellular functions. The watch will behave exactly like the GPS (non cellular) model, and all other functions will work. In fact, the Bluetooth link via iPhone when the phone is in range is the default communication for all Apple Watches, and the cellular radio is the last resort fallback method. Cellular is heavier on the watch battery so it is only activated when the other routes are unavailable.

Adding... if you are using the watch only in non cellular mode through your iPhone you don’t even need to tell your network, unless you do so much extra that you need to increase your data allowance.

julieda wrote:

Check with your local carrier.

Wrong, wrong, wrong again. The carrier/network doesn’t even need to know about watches used in non cellular mode. They don’t care, they don’t have any right to know how the paired iPhone is being used provided payments are made according to the current plan.

Or a knowledgeable volunteer like Branta_UK could tell him and he wouldn't have to bother with wasting his time contacting his cell provider.

Check with your local carrier.

Maybe his local carrier could tell him the same thing you just did.