Apple watch series 4 gps , does it allow you to answer calls and text messages.?
Apple Watch series 4 gps
Question marked as
Yes. Like all other watches, you can answer calls and messages.
If you buy the GPS only version you'll need the iPhone nearby, or if the iPhone is not nearby, you'll need the watch to be connected to Wifi, and the paired iPhone to be connected to cell data or wifi as well.
See here: How to use your Apple Watch without your iPhone nearby - Apple Support