Gizmo Project started advertising free phone calls and just released a client for the 770 - so I played with it. First of all the 770 client is totally unstable, it basically works but crashes a lot! The GUI (especially the contact details on the right side of the screen) is hard to use. BUT calling works like a charm! I called several land line and mobile numbers without any problems, and according to the other side it was nice and clear.
Btw. the advertised free calling only works for other Gizmo users who need to enter their land line/mobile number into their Gizmo accounts. I guess its kind of fair - free calls for more customers/users.
your comment...