Though it hasn’t been released yet, the new iCall software for the iPhone will allow callers to switch between voip and gsm whenever a wifi connection is present.  This means cheaper calls whenever you are near a wifi connection.

Of course iCall for the iPhone is still in beta, but lucky enough we can watch the preview video of just exactly how it’s going to work.

iCall VoIP on the Apple iPhone from Arlo & Andy on Vimeo.