Android iPhone Blackberry call forwarding

I'm making a feasibility res开发者_StackOverflow社区earch for a mobile app (iPhone, Android & Blackberry) project. In short, there is a list of phone numbers, and if incoming call (caller id) is in that list, forward it to a specific(fixed) number (basic call forwarding). Has anyone made anything similar? Thank you in advance.

While BlackBerry provides an interface to monitor calls (inbound/outbound/historical) and provides a fair bit of data about them, no interface is exposed in BB that allows you to forward a call. I believe that this is because forwarding is performed before the call actually reaches the BB device; so it's not the device that's doing the forward, but the carrier/pbx.

I think the answer will be similar for the other platforms, but I don't have experience with them.