Remember the Dell Voce app for BlackBerry? It was actually powered by Waterloo based company Fongo who specializes in Voice-Over Internet Protocol (VoIP) services. The Dell Voice app isn't available for BlackBerry 10 at this point but the folks at Fongo are seemingly already working on bringing their Fongo app to the BlackBerry 10 platform.
On their Facebook page, they've dropped hints by posting the BlackBerry logo and noting more but perhaps the more compelling evidence an app is in the works comes from a Fongo employee on Twitter where images of the app up and running were posted. Given the images show a bottom bar, it seems as though the app might just be their Android version but either way a Fongo app arriving in BlackBerry World would be great to see.
I'd be remiss to not note though that right now, Fongo is only supported in Canada and only in certain regions. For those that do have access to it though, it's a great service that's packed with a lot of features and is potentially a money saver depending on how often you find yourself needing to use it.