When we install new apps on our iOS devices, they don’t just take up the storage space needed for the app itself, but they also consume space needed for storing “documents & data.” This can be all sorts of things, including save files for your games, pictures, videos, and content downloaded through in-app purchases.

Here’s how to see how much storage space each of your apps is using for “documents & data,” and how you can reclaim that precious space.

A number of Cult of Mac readers, and numerous more on Apple’s Discussion boards, have reported a bevy of problems–some large, some small–after upgrading to iOS 4 or the iPhone 4. I don’t plan on boring you with a list of what users were complaining about. Instead, I will give you four troubleshooting tips that generally fix most, but not necessarily all iPhone and iOS problems.