How to delete apps from iPhone permanently to make a free disk space on the iPhone?

Sundal NT

New member
I'm using iPhone 3GS 32GB, and ATM, the iTunes indicates that my iPhone has 21.46GB size for the App. I tried to delete some application through iTunes library. But even the applications are gone, the size won't reduce, and i'm so afraid because my free disk is numbered.

My question is, how do i delete some of my iPhone App permanently so it looks like i never download it? I really need more disk space in my iPhone...
 
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