I wish to get one channel (Smithsonian) that is not in my "Prefered" plan. When I enter the channel number the screen says I am not subscribed to that channel and gives me the option to subscribe. Does anyone know exactly what will happen if I subscribe, i.e. does it merely bump me up to a higher cost plan or does it let me get the channel for a (lower) fee on my current plan? And, if the latter, does the subscription expire or remain until I wish to unsubscribe?