Other taking up all the memory on my iPhone?

The space labeled "other" is taking up All the memory on my iPhone. It's taking up about 5.2 gigs right now, which is far too much, considering I have hardly any photos, music or data. Also, I just reset my phone so I have no apps, and it is still taking up that much room. How can I go about deleting what is in the "other" category.

Added (1). Also: my iPhone is not jailbroken

If your phone is jailbreaked, than this is the issue.

"Other" includes everything that is not audio, photos, apps, or books. It includes videos, messages, app data, and iOS itself.

It may be normal for your iPhone.iOS 6 is bigger and will account for at least some of the difference from what it was before.

Settings > General > Usage > Storage shows you how much data each app uses.

If it still doesn't seem right you can force a recalculation of "other" by the following

Connect the iPhone to a computer and launch iTunes
Select the "Summary" tab and scroll down to "Options"
Un-check the box "Open iTunes when this iPhone is connected", then check it again
Sync the iPhone.

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