"Samsung leads in dual-mode WiFi/cellular handset revenue market share, followed by Nokia (NYSE:NOK)"
This seems unlikely, unless it specifically excludes smartphones from the definition of "handset." Nokia announced in its results last week that "The Eseries sold almost two million units since its introduction in the second quarter 2006." - presumably accounting for a fairly large chunk of the total €1bn sales of its Enterprise business unit.
The E60, E61 and E70 have WiFi, while the E50 and E62 don't - and it seems to be the E61 that's the winner at present, which I guess goes for around $300 ex-factory price. Added to its N80, 6136 & other WiFi-based dual-modes, I'd be surprised if it hasn't shipped $500m+ on its own. I suspect HTC's in the same ballpark too with its various PDA-style devices, many of which have WiFi. Apart from the Samsung P200 and T709 UMA versions (which have probably shipped <100k units), I can't see where it's getting the volume, unless it's selling a shedload of WiFi/CDMA devices in Korea.