Hi stevesr0,
I had the same inquiry just a little while back and found a solution which I stated in this thread:
https://www.mobileread.com/forums/sho...ght=phone+voip
Just a few more things more things though:
Since there's no 3g on the edges you'll only get to talk when your in a wifi area.
No free international calling and no international callers.
If there is echo, try using headphones.