We will be touring France and would like to call with our US based global adapted cell phone within France to another US based global adapted cell phone. How do we do this? Thanks so much.
What do you mean by "global adapted"? Are you using your own numbers with an international roaming plan, or are these unlocked phones that you will be buying SIM cards for when you get to France?
From my experience, you can call the regular US number, sometimes you need to include the country code (depends on plan). You will be charged on both ends for international roaming.
Check your vendor's web site. I know AT&T's site provides this answer and suspect the others do as well. Enjoy your trip.