Can I use an Apple Watch with an iPhone on boost Mobile?
We have iPhones on boost mobile. They don’t have Apple Watches or plans. Can I buy a watch that she can use with her phone?
[Re-Titled by Moderator]
iPhone 12 mini, iOS 17
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You can use an Apple Watch without a cellular plan, and as long as the watch is connected to the iPhone nearby via Wi-Fi or Bluetooth.
Have a look at the related article:
Use your Apple Watch without your iPhone nearby - Apple Support
But, without a cellular plan, you can not use Family Sharing to set up the Apple Watch, you will need to pair the watch directly to an iPhone.