An interesting article in Fortune asks whether Wi-FI will revolutionize the phone. In particular, it talks about wireless of hotspots and the real possibility of multi-more phones that will allow you to call over IP when you're inside a hot spot and avoid cell charges. Cisco already has a portable handset for use with Wi-Fi networks. I make calls right now over Wi-Fi since that's the only internet connectivity I have and Vonage is my phone provider. There's no great technology breakthrough required here---just a little integration.