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I can make free calls over WiFi with my Android phone all day long. I use GooveIP, but there are other VoIP apps out there. I could even call somebody's BlackBerry, if I knew anyone that actually had one. I suppose there must have been some security basis for ONLY allowing those free WiFi calls to other BB users. Why would they limit it like that? Maybe they just didn't want their free service getting used much. :-/
BTW, low cost carrier Republic has based its business model on its customers making calls over WiFi, so RIM isn't exactly offering a new, cutting edge service.