Not enough available storage to download - iPhone 4?

Whenever I tried to download an app I get a pop-up saying "There's not enough available storage to download… ". I have also gotten the same message when I try to take a picture. I have 3.8 GB remaining on iCloud & 2.3 MB remaining in storage. I only have 190 photos, no videos, 10 apps, 50 something contacts!
It says 3.4 gigs are used for apps and 2.5 gigs is "other". What is this other? Someone told me it is messages, so I deleted almost all of my texts. WHAT DO I DOOO?

Take your photos and copy them to your computer to free up all that space. Alot of things can cause the other data to go higher then normal, and its often an app you have (and often jailbroken phones). See if yours is any of these: http://www.justtext.com/messageboards/20130215171154.html