I have a Zumo 550 and I've paired it with my iphone 4 but the Zumo doesn't get the calls. The phone vibrates but doesn't ring when connected to the Zumo, but the Zumo doesn't receive the call. Any ideas?
I have found that during a call initiation, incoming or ringing out, there is an option to to select the source(I think), on mine I get choices fro the Viseo (Merc BT setup), iPhone or Loudspeakers.
Youy may too, think it remembers the last choice - even while connected by BT
HTH