What would it be based upon? It lists Romania as available, but there are no actual directories and it's illegal to maintain such a list without consent - most I saw were a compilation of numbers and names from various crawlers that searched public information areas like Facebook. And they look quite large but considering that we have several million mobile users alone, they seem woefully lacking. If it really is just an interface for a search then something simple, like a wget and a parser could be thrown together as a script and called from an open application, like recaller or espeakcaller.