This already exists! An iPod Touch with Skype on wifi is the best home phone I've ever owned. But would I really call it a mobile phone, or consider a wifi only

This already exists! An iPod Touch with Skype on wifi is the best home phone I've ever owned. But would I really call it a mobile phone, or consider a wifi only phone? I spend a lot of time in my car, and of course don't have stable wifi in there. I tried to pretend my iPod was a wifi-only phone for a few months, but it didn't work out for me. Perhaps wifi availability is good enough in densely populated urban areas, but is using random wifi across the city secure? It will be interesting to see what Microsoft does with Skype and the carriers, though. MS is not in a very strong position in the mobile phone market, and I can't imagine the carriers like Skype at all, as charging per minute and per text rather than by the MB for data is much more profitable. The neutered, 3G only version of Skype that came with ym Verizon phone, which counts US domestic calls against your normal calling plan, shows what Verizon thinks of Skype. That's "Skype Mobile", there's another Skype which works only on wifi. When you call Skype-to-Skype on "Skype Mobile", it dials a 1800 number in Atlanta, and the sound quality is terrible. On the same phone, the wifi Skype has markedly better sound quality. It seems to me that since I'm paying $25 a mo. for unlimited 3G data, I should be able to use the data to make Skype calls if I please. If Microsoft can make that happen, more power to them.