Some engadget fans were lucky enough to beta test this beauty, the T-Mobile UMA. So whats so different about this phone versus others? The ability to transfer phone calls utilizing UMA between traditional GSM networks and a compatible WiFi access point, that’s what. At this time, there are mixed reviews. Some report calls dropping during the GSM to WiFi transfer and poor call quality on WiFi mode. While others report flawless functionality. T-Mobile plans to charge a couple bucks of month for use of UMA. Regardless of cost or the quality of UMA, it is definity a great idea.

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