the at&t hidden interface for call forwarding
Immediate Call Forwarding: Dial *21* plus the 10-digit number to which your calls should be forwarded and #. Press Send. Busy Call Forwarding: Dial *67* plus the 10-digit number to which your calls should be forwarded and #. Press Send. Call Forwarding No Reply : Dial *61* plus the 10-digit number to which your calls should be forwarded and #. Press Send. Call Forwarding Not Reachable : Dial *62* plus the 10-digit number to which your calls should be forwarded and #. Press Send. unlike this http://www.wireless.att.com/learn/basics/choosing-features-services/call-forwarding.jsp reference sheet, the above are direct ways of manipulating the call forwarding features that many of us enjoy (without knowing).