Will it be possible to use popular VoIP applications such as Skype on the OpenMoko platform?
Perhaps. Hardware issues mean that it won’t work well on the Neo1973. (the typical latency of GPRS is far too high). Also, Skype is a closed source application, which does not provide binaries that would be suitable to run on OpenMoko. Skype’s vendor could of course choose to provide binaries for OpenMoko phones. However, many telephone providers’ terms of service agreements preclude running VoIP over their baseline GSM service.