Do you need separate cellular plans for your I watch and iPhone?
Do you need separate cellular plans for your Apple Watch and iPhone or will your iPhone cellular plan work for both?
iPhone 6 Plus
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The Cellular Apple Watch shares the iPhone's phone number. A cellular carrier that supports the Apple Watch will add a monthly fee to your iPhone bill for this phone number sharing service. In the U.S. it is $10 per month added to your iPhone bill.
iPhone Cellular Carriers that support the Apple Watch, which models, the radio frequencies each model uses, and the country where they offer service: