Analysis P2P VoIP network Skype and client developer Fring have engaged in an epic slanging match after Fring's implementation of mobile-data video calling on the iPhone appeared to result in its ousting from Skype. At present Apple's own software only allows video calling on the iPhone 4 - the first iPhone to feature a user-facing cam - via the phone's Wi-Fi connection to another iPhone 4. This generally ensures decent call quality; it also placates the mobile networks, who are already struggling to deal with the surge in mobe-data demand precipitated by Apple phones (and to a lesser extent, other smartphones). Fring's app allows video calling between most smartphones over 3G mobile links as well. However, Fring makes use of other VoIP and IM networks - in particular, of Skype - to actually let its users get in touch with each other, rather as some apps will integrate different IM networks.