Tmobile launched a test in Seattle of their @Home service which costs an additional $20 per month for unlimited calling from a home access point as well as any T-Mobile HotSpot. Customers who purchase what Tmobile dubbed a HotSpot cell phone (either a Nokia 6136 or Samsung T709) can make unlimited US data calls using pre-approved WiFi HotSpots instead of the cellular network. Anyone out there signed up yet? Got feedback?