UK-based Truphone, a VoIP service provider for Wifi/data enabled handsets, today unveils a special version for owners of the iPod Touch, version 2. The move is significant. The software effectively turns the Touch into a mobile phone, if limited to calls over WiFi. But there will be plenty of young people and college students who will use the Touch now for calls over their campus networks. For not only is the software free but the calls will be too: to other iPod Touch owners, to customers of Truphone’s Internet telephony service, and to Google Talk users. Other features are planned like calling to normal landlines, calling and IM to Skype and MSN users, as well as Facebook and Twitter integration.