Use without an iPhone as a Kid or Senior
With watchOS 7 or higher you can use an Apple Watch LTE model to pair with one iPhone and then use the watch as a standalone device with its own phone number.
This means you can give a kid or a senior a connected Apple Watch. This offers tracking, communication, fall detection, and a nice way to allow a family member to stay connected without carrying an iPhone or adding the expense of an iPhone.
With this setup the user can call, text, stream music, use Siri, and download apps right on the phone. You can set up parental controls as well.
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