I always used to use Mode 2 VCP, and as far as I recall, at some point the 'co-pilot' contacted the tower as requested.
I tend to use Mode 1 now for the whole flight - a bit more 'hands on', but even though I tune my radio to the tower frequency given, at no point when I try to contact the tower (and I have experimented with various distances from the airport to do this, including of course when established on the localizer and/or glideslope) do I ever get any response from ATC. After I land and turn off the runway, my 'clear of the active' announcement is answered OK.
Am I doing this wrong somehow? There's not all that much to get wrong really, unless I am pressing the wrong key for this instruction (I use the same key I always use to contact ATC)? I attach a log anyway.
Many thanks,
Martin