Is UMA the Missing Link in Wireless Connectivity?
If this happens, and if UMA works as advertised, it could have a revolutionary impact on mobile devices of all sorts. Enterprises, for instance, could create "voice over WiFi" networks that could lower costs while allowing smart devices to live up to their potential. It also could allow laptops to go online even when no wireless hotspots are available. The handoff between the WiFi and cellular networks, however, would have to be seamless.
Incidentally, the "unlicensed" in the UMA name refers to the portion of the wireless spectrum for which the FCC does not require a broadcast license.
Source: Russell Beattie Notebook, Phonescoop.com