why does my phone use so much ram?

Here's a question, and Im not being a jerk.

What would you rather do with that RAM instead of using it to cache and run services and system processes? "Free" RAM is 100% wasted RAM.

Seriously,
when you got a fast peformance phone with non removable battery,you will suffer.
It is because more ram usage means more battery usage so your phone battery is easier to drain when your phone use so much RAM.
 
Android runs services in the background, some of which can be disabled. However, its mostly touchwiz (the skin that runs on your phone). It takes up most of that 1.3 itself. To give you a better picture, stock android (what's comes on the nexus devices, takes up 500-700mb by itself.

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