Sorry for reviving this thread. But I do want exactly that. Set the call forwarding (with USSD codes) by means of dbus call from within a script.
(I have dual SIM adapter and want the forwarding to be en-/disabled automatically on switching.)

Already puzzled with USSD packages, but no success. Also tried to escape/bundle those characters in string....

So, anybody got a solution here?
Could also be anything else, but I need to get those codes activated from within a script.

P.S.: of course got *#-enabler installed and working fine fom call-ui...