Google has brought Gizmo5 an online phone company that has alot fewer customers then the hig rank online phone company's like Vonage or cable company's. Google spent $30 million on the company wow!
Gizmo5's has an open standards-based online calling system. Add to it the new ability to route calls on Google's network of cheap fiber. Google has Voice's free phone number, which will ring your mobile phone, your home phone and your Gizmo5 client on your laptop.
You can use Gizmo5 to make ultracheap outgoing calls to domestic and international phone numbers, and free calls to Skype, Google Talk, Yahoo and AIM users. You could make and receive calls that bypass the per-minute billing on your smartphone.
This will give other phone companys a run for it's money, sound really good to me and worth checking out when the service comes out.