Apple Watch series 3 GPS
Will I be able to answer calls with just the GPS watch? Do I need the cellular watch to answer calls ?
Apple Watch
Question marked as
The GPS only Apple Watch can do Everything the cellular model can do as long as your iPhone is nearby, where nearby is somewhere in the same 3-4 bedroom home (assuming typical wood frame construction).
https://support.apple.com/en-us/HT205547
The cellular model will allow you to leave your iPhone at home and go for a walk, run, bike ride, etc...
A cellular Apple Watch shares the iPhone's phone number. This requires the iPhone cellular carrier to support the Apple Watch. For this service, the iPhone carrier adds a monthly fee to the iPhone bill. In the U.S. the fee is $10 per month added to the 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: