These commands allow you to manage call forwarding for your own user and will apply to all of your phone devices and will work even if all your phone devices are offline.
Update Call Forward Number: *56 - Dial to update the number that phone calls will be forwarded to. Does not enable/disable call forwarding.
Enable Call Forward: *72 - Dial to enable call forward, it will also prompt for a new call forward number. If you use call forward to the same number regularly, use *74 instead.
Disable Call Forward: *73 - Dial to disable call forward.
Toggle Call Forward: *74 - Dial to toggle between enabled and disabled.