Yep, you can find a lot of similar thread here. Same as with Whataspp, Viber is not unfortunately supported by Asha 200 at the moment.
16-02-2013 13:01 - edited 16-02-2013 13:03
I won't get into further details, but there is a technical reason why these apps don't work on Nokia's dual-SIM devices, though they work on their otherwise pretty much identical single-SIM counterparts (in this case Asha 201). The developers of those apps could probably provide the "official" answer.