upgrade my watch to cellular
If I purchase Apple Watch series 5 gps, can I add cellular later?
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The GPS only Apple Watch does not have a Cellular radio chip inside.
You would have to buy a Cellular Apple Watch to get that cellular radio chip.
Also, your iPhone needs to be an iPhone 6s, SE (1 or 2), 7 or newer, running iOS 13 or newer, in order to pair with a new Apple Watch.
The Cellular Apple Watch shares the iPhone's phone number. This requires the iPhone cellular carrier to support the Apple Watch. The iPhone carrier charges a monthly fee for this service. In the U.S. the fee 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:
https://www.apple.com/watch/cellular
So before you do this, make sure that your iPhone will pair to the Apple Watch, and that your iPhone carrier supports the Apple Watch.
