How to delete other on my iPhone 4S?

I've had this issue for a while. I hardly have any apps or pictures on my phone and maybe a gig of music on it. I have only 1 gig available and the rest is taken up by this "other" section. Please help? I've done all the basic things and it still won't help

"Other" holds things like system software, contacts, Messages data, settings and things that are not listed elsewhere in the capacities list. If you want to know how to delete the "other" files, this step by step guide will help you a lot.
http://www.mac-dvd.com/how-to-delete-other-capacity-in-itunes.html

The "Other" data contains app cache files, Diagnostic& Usage Data, iTunes synced-failed files and more. You need to clean up your app and iTunes library with some app clear tool.
http://www.fireebok.com/resource/how-to-delete-documents-and-data-on-iphone.html