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also i had this prob sometime back wen i was updating all my applications n had to stop it all inbetween cuz i was incurring data charges...frm then onwards my ram usage was high....later then wen i updated all my apps n stuff, n now i have apps upto 8 pages in the menu and i get a ram usage of 230 while using n if i clear the ram it goes to 140-160....
Hope this helps