Even if they are not on the wrong freq, 'Standby/Monitor/Listen out', whatever, many pilots don't seem to be able to keep their mouths shut anyway.
GMC: 'Birdseed one-oh-one, monitor one one eight decimal five'
'Listen Point five, one-oh-one'
……….
'Heathrow Tower, Birdseed one-oh-one, we're with you, listening (monitoring/standing by) one one eight five, holding on the left, we're fully ready when you call us, just waiting for the cabin…..' blah blah etc etc