Cellular and Wi-Fi networks are moving closer to gaining overlapping capabilities. Mentioned in the last newsletter was the Enterprise Mobility Solution from partners Motorola, Avaya, and Proxim, still in early trials. This approach uses CPE to handle signal handoff between the enterprise Wi-Fi network and a carrier\u2019s cellular network, putting enterprises in control of wireless network unification.Seamless roaming services for consumers are also en route - perhaps. Carriers and handset makers have been cooperating on phones that support Unlicensed Mobile Access (UMA). UMA-enabled devices and networks allow user phone calls to bridge the two types of networks transparently using IP while the carrier remains in control of the service and likely charges different rates when the user is on different networks.UMA-enabled devices made an appearance at this month\u2019s CTIA Wireless show in Las Vegas: Samsung Electronics rolled out the UMA-enabled t709 phone at the event, while Nokia's 6136 and Motorola\u2019s A910, which were introduced in Europe in February, were demonstrated.But carriers and handset providers are still working on roaming software among disparate wireless networks. Some analysts I've talked to expect them to achieve \u201csoft handshake\u201d capabilities by year-end. Most U.S. carriers haven\u2019t made announcements, though, about if and when they will make UMA-based roaming services available. Cingular Wireless has said it is \u201clooking at\u201d the technology.Some users are skeptical about the emergence of converged carrier-based services, because of a lack of business incentive for carriers to hand over minutes of revenue to alternative networks, such as the Wi-Fi enterprise network.\u201cWe don\u2019t have a positive outlook for its success, because we believe that our wireless vendor partners don\u2019t think it\u2019s in their best interest to\u2026[let] minutes of revenue fall off their network,\u201d says the global network architect of a worldwide consumer goods manufacturer.He predicts there \u201cwon\u2019t be a rich array of devices from our service provider that support GSM and 802.11.\u201d However, he\u2019s not interested in managing a gateway for signal handoffs himself on the company\u2019s premises.\u201cThat\u2019s too complex operationally. Our operational preference is to buy [combined cellular and Wi-Fi services] as one clean managed transaction from our wireless operator,\u201d the architect says.