Market size: Large (> 10,000,000 people)
Investments required: Small (< US$50,000)
Often, when we dial a new number, we get connected to a wrong callee. It's embarrassing, and often very embarassing, for both the caller and the callee.
A "Callee's ID Confirmation" service, applied to the numbers dialed manually, i.e. not taken from from the contact list, would show the callee's ID before making the connection. If the caller confirms the ID is right, the connection is made.