Set up and use cellular service on Apple Watch – Apple Support (UK)

Your Apple Watch with cellular uses the best network connection available to it—your iPhone when itʼs nearby, a Wi-Fi network that you’ve connected to previously on your iPhone, or a cellular connection. You can turn cellular off—to save battery power, for example. Just follow these steps:

Press the side button to open Control Center.

Tap , then turn Cellular off or on.

The Cellular button turns green when your Apple Watch has a cellular connection and your iPhone isn’t nearby.

Note: Turning on cellular for extended periods uses more battery power (see the Apple Watch General Battery Information website for more information). Also, some apps may not update without a connection to your iPhone.