MobileMag has an excellent review of the Zyxel Prestige 2000W WiFi VoIP Phone. One of the first WiFi VoIP phones on the market, it features excellent range (300m outdoors, 75m indoors) , stylish design, LCD display, and it works with any SIP provider. It is available now and priced at $165 – $229 depending on the store.
“The Zyxel Prestige 2000W is based on SIP v2 (Session Initiation Protocol version 2.0) open standard, this makes it interoperable with most major SIP-based providers, IP-PBXs and other standard SIP-based client devices. This makes it compatible with just about any SIP provider out there, so long as they give you access to their gateway, proxy with a login and password. ”