Interesting article here about the trials & tribulations of the new T-Mo US dual-mode service. No wonder there's been no nationwide rollout in the US yet.
Even leaving aside the difficulties in getting the technology tuned... is it just me, or are other people also staggered by the line "regularly exceeded their 2,000-minute-per-month T-Mobile family plan". I know you lot the other side of the Atlantic talk an awful lot on the old dog-and-bone, but even so, that's an awful lot of chatter. I probably talk about 200 mins / month on my mobile (incoming & outgoing) plus maybe another 400 on Skype & fixed-line put together.... and that's including doing hour-long briefing conference calls.
OK, maybe 30 mins each per day isn't that much, if you spend all day at your desk or in your car making sales calls. And I guess it puts people in the rare category of actually regularly using the WiFi / cellular handover bit, if they're always gabbing away to clients on the phone when they get home in the car. I'll add that to my list of "niche target markets for dual-mode usage", along with Finns' second homes in remote forest areas which have better broadband connectivity than cellular coverage.