I have the eris and when I go into my advanced task killer to kill some apps running it will say like 27m in the top corner. Ill kill apps and it will go to like 40m. How do I make that number bigger so there is more room on my phone? like the one time i killed the apps I left my email and texts open thats it and it went to 70m but now its only around 40m when i have just email and texts. why?