It would be great if you could use the software for your own callback solution.
So you would set your own callback number, just call the number you want, the software call the callback number, waits for the callback, passes the number and you get connected.
Found it:
http://www.freedownloadscenter.com/N...ian_S60v2.html
I guess there must be simular software packages that can do the same on you mobile.