You can do this from theAppleWatchapp or by erasing your oldAppleWatch. Pair your newAppleWatchwith your iPhone. Duringsetup, tap “SetupCellular” to add acellularplan.
SettingUpCellularonAppleWatch. When you firstsetupyourAppleWatch, you’ll be asked whether you want to connect it to yourcellularplan. It’s okay to skip this initially; you can always set it up later via theWatchapp on your iPhone.
Settingyourwatchupcan take about 30 minutes. Here’s what you need to get started: Awatchcapable ofcellulardata. An active Xfinity Mobile phone with access to eithercellulardata or WiFi.

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Please check with your carrier for details and see support.apple.com/en-us/HT207578 for additionalsetupinstructions. International emergency calling requires anAppleWatchSeries 5 (GPS +Cellular),AppleWatchSE (GPS +Cellular),AppleWatchUltra, or later.
How ToSetupCellularOnAppleWatch! Cómo configurar el servicio celular enAppleWatch.

Thissetupgives theAppleWatchuser the ability to use thewatchto make/receive calls and send/receive messages and data using their own phone number that is independent from the iPhone.
Get step-by-step support to connect yourAppleWatchto the Three network with Smartwatch Share.Setupcalls, texts & data; with no phone needed.

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