surely ther must be someway to use bt

[westentertainer]

my 620 is a bt anywere phone ,it used to be wm6 so i updated it to kavanas 6.1 now its a great phone the only thing i miss are the wi fi internet calls that come with the bt software .i have been told on a bt forum that the only way to use this facility is to revert back to wm 6 ,surely with all the knoledge of the mods and members of this forum you can prove them wrong
does anyone know a way? many thanks in advance