Quite often I get a stupid message on my Nokia 6630 telling me that there is not enough memory and that I should close some programs. With no task manager and no simple way to know what programs are running this is a very annoying message! But, there actually is a very fast and simple way to close all programs. Simply open the memory card cover and close it again. As you might have noticed the Nokia actually closes all programs when you do that (to prevent loss of data if you remove the card).