When active, your phone will notify if you receive a call while you are already on another call, allowing you to put one on hold and answer the second call.
When active this will divert calls if your phone is off, you don't network connection or are otherwise unreachable.
Check Status: *#62**#
Deactivate: ##62**#
Activate: **62*<Phone Number target>#
If you don't answer a call, it we be diverted to a phone number you can set here
Check Status: *#61**#
Deactivate: ##61**#
Activate: **61*<Phone Number target>#