this is a must have app that everyone should have. with out this many people would have only short living battery for a day just because they have to many apps still running and wasting the battery. i use it so that i can have a longer lasting battery so i can communicate with others after using some of my apps so i just use the advanced task killer and helps very much. i fist heard this from a friend saying this all was is saves his phone never believed him till i tried it may and i was amazed on how grate it worked. i loved it and i well always use it forever.