I mentioned in an earlier blog entry about WiFi phones, at the moment there doesn't appear to be many of them available and those that are available such as the F1000 WLAN-VoIP-Mobile have the appearance of an early Nokia design.
Fashion consciousness and battery life aside, a WiFi phone is still a pretty good idea especially if you think of the potential available when you have a WiFi network at home and one at work and you couple the WiFi phone with services such as SIPGate or even BT Communicator. BT Communicator is a service launched by BT and Yahoo enabling you to receive calls on your PC when someone is using your home phone or to make calls on your PC that are billed to your home phone. What many people don't know is that BT Communicator is actually a SIP service that can be used from traditional SIP clients such as X-ten or even a F1000 WLAN-VoIP Mobile (have not tested the service on this yet), but when you consider that BT now allows you to connect freely to BT OpenZone WiFi hotspots for BT Communicator and BT Yahoo Messenger traffic (even more useful when MSN and Yahoo messenger finally allow cross messenger traffic) you can quickly see how much money you will be able to save making calls charged at landline rates over your WiFi phone.
It suddenly makes you wonder why BT didn't put these two technologies together when launching their BT Fusion service which is basically a mobile which is routed over the mobile network when you are out and about but when you are at home your calls our routed over the Internet via a Bluetooth router in your home connected to your BT Broadband connection. I suppose using Bluetooth in a phone is a much easier step seeing as the technology has been in phones for many years now compared to WiFi. Hopefully the next version of Fusion will support this, but if it doesn't you can still use the do it your self approach above or get some funny looks chatting to your laptop in a BT OpenZone hotspot