How to clear out my other space on my iPhone?

My current "Other" category on my iPhone 4 8g is taking up 3.1g of space. What is in this category and what can I do to get rid of it?

It is the space from the updates. You can't clear this space

Try to delete your messages and recent calls and move stuff into your iCloud.

Try to delete your messages and recent calls and move stuff into your iCloud.