Nokia 6300i has VoIP support
What is the idea? Well, VoIP allows you to conduct a call from any location with WiFi coverage. On the other hand, unlike UMA (which is supported in the other WI-Fi capable variant of the phone, the 6301), you do not depend on the GSM carrier but have to use subscription from VoIP provider such as Vonage, Packet8 or Skype, for example.
Nokia expects to start shipping the 6300i in the second quarter of the year, at an estimated price of EUR 175 ($275).
Nokia 6300i Specifications