From today, mobile users who can access The Cloud’s Wi-Fi hotspots will be able to make free mobile VoIP calls to a variety of messenger networks and fring users, thanks to a customised version of the fring mobile VoIP client.

This joint service, announced today by fring and The Cloud, lets users call and chat for free to users of fring, Skype, Google Talk, Windows Live Messenger, and SIP contacts, via The Cloud’s Wi-Fi network, as well as other Wi-Fi, 3G, and GPRS networks.