Normally, your cell phone can only tell you who is calling you if their number is already in your address book. Skydeck Caller ID tells you who is calling you when their number is NOT in your address book.
On Android phones, the Caller ID will appear before the call. On BlackBerries, just let the call ring out and Skydeck will look up the number (Why don’t I get the information before the call?). On iPhone, the caller ID may be delayed for up to one day.
Skydeck uses multiple databases and verifies the results against the address books of other members who have opted in to this feature. You can easily add the contact to your address book after the call.