What does your bluetooth manual say?
My guess is that you delete both phones
from the system and pair them in the
reverse order that you paired them to
begin with.

http://www.bmwmotorsports.org/pdf/B8...ManualIBUS.pdf

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….