Make phone calls over WiFi?

Nokia is jumping on the UMA (unlicensed mobile access) bandwagon with the 6136, a GSM phone that also works with LANs over WiFi. With UMA and the operator-variant Nokia 6136 you can use the Internet for your mobile phone connection, providing excellent coverage and sound quality even in areas where mobile phone reception has previously been poor. It's technology made easy - the phone automatically selects the optimal network so you can relax in the knowledge that you have the best possible connection.

Many of Nokia's mid-range and high-end phones will feature Wi-Fi, and UMA allows the user to keep one phone number, one handset, and receive one bill at the end of every month.

Very soon, mobile minutes at home will be free.