EarthLink will test a custom Accton voice over IP (VoIP) over Wi-Fi phone on their metro-scale networks, starting in Anaheim: The service and handset are free during a testing period, and includes only domestic calling in this period. The phone's charging cradle is also an 802.11g gateway. Anaheim customers can contact the company to sign up for testing; Anaheim is one of EarthLink's earlier large-scale deployments.
The phone and cradle/gateway are expected to cost $100 at launch. Unlimited domestic inbound and outbound calling will likely be $25 per month, and 500 outbound/unlimited inbound domestic calls would run $15 per month.
The service and phone don't require a subscription to EarthLink's metro-scale network, as it will work with any broadband network. Of course, if you want wide-area roaming, their networks are the obvious choice as a provider.