Other operators will watching T-Mobile's trial of its HotSpot @Home service in Seattle closely. The service permits users to make VoIP calls from their mobile handsets (wi-fi enabled of course - T-Mobile hotspot preferred!) and switch seamlessly over to the cellular network when the user drops out of wi-fi signal.
T-Mobile also provide a wi-fi router for free - so they must be taking this seriously! Some reviews at RCR News.
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