Apple Watch Series 0 folks, run with, or without, your iPhone?

[ra4oasis]

I know the Apple Watch uses your iPhone's GPS for calibration, but once you've run a couple of times, is there any reason to keep running with my iPhone? I'd love to be able to leave it at home.

 

[Julien]

Map of run, more accurate distance, mapping/location info if needed, emergency phone calls, camera, etc.