If they are the free Apple apps that came with the iPhone, they cannot be removed.
To remove 3rd party apps, tap and hold an app icon until all app icons start jiggling and an X appears in the upper left corner of 3rd party apps. Tap the X on an app you wish to delete and confirm in the popup window.
Mac mini, OS X Mountain Lion (10.8.2), iPad 4, iPhone 5 (iOS 6)
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