Found out the issue is handing off. There can be a 3G radio and WiFi radio with UMA, but they haven't figured out how to hand off a 3G voice call to the UMA infrastructure in the time it takes to walk away from a hotspot. Honestly, not completely a non-issue with EDGE and UMA. Maybe, they should have just built a wider network, instead of a slightly faster one in certain places. It went from 2G in my driveway and no signal in the house to 3G in my driveway and no signal when they deployed Wichita, KS.
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