If you're on an iPhone, you can quickly swipe down from the right corner to access your Control Center and ensure the cellular icon is green, not grey, to indicate it's on and ready to use.

Open the Control Center by swiping up on the face of your Apple Watch. 2. Look at the Cellular icon. It looks like an antenna with signal waves. 3. If the button is green, you are using a cellular ...

To turn off cellular data, tap the cellular icon so it's not highlighted. When you do this, you'll still be able to make and ...