Extend the diverted call display on a mobile

I have a virtual land line that diverts to my mobile (a Nokia 6234). When someone calls the land line, the display on the mobile comes on to indicate that the incoming call is a diverted call and then reverts to the normal display of the originating number. I want to know if incoming calls are diverts when I answer (or choose not to answer), but if I'm not looking at the display when the phone starts to ring I miss the diverted call indicator and can't tell. Is there anyway to keep the diverted call display on the screen on this or any mobile? Or does anyone know of a mobile phone that can have a different ring tone for incoming diverted calls?