WiFi phones themselves are not new. At CES, Vonage was showing off some WiFi handsets made by Audiovox. Vonage's phones can also be used with protected WAPs, as the Audiovox model has the ability to store four base station IDs and passwords. As you might be able to guess, entering a 26-digit hex key on a phone is rather annoying, but once it's in and stored, the phone itself works well. I was able to make calls from within my house and over open WAPs with no trouble, although I found the battery life limiting.
In the mobile phone space, the true holy grail is a handset that works seamlessly across cellular and WiFi networks, and while a handful of such phones have launched, such functionality is nowhere near commonplace. The VoIP handset market could become quite interesting once municipal WiFi networks are up and running, however. With a Skype (or other WiFi phone), some city dwellers might decide to drop both cellular and landline phones in favor of WiFi handsets. Factor in free calls in North America through the end of the year, and a US$189 handset doesn't look that expensive.
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