I can't download apps on my iPhone 4?

Around October my phone stopped downloading apps. I think it's a virus, but I don't know what for. It won't let me take pictures or download music, movies, or apps. When I try to do any of those things it says there's not enough space, but I can take screenshots. So i don't know please help if you can.

If you don't have any storage you can't download anyting or take any pics but you can take a screenshot

  • Why do apps download on other devices when I download on my iphone? Okay so for the past few months I've downloaded some apps and I noticed that those same apps download on other devices such as my parents iPhones and iPads. How can I stop that from happening?
  • Why can't I download some of the apps on my iPhone? Okay, so I wanna download apps onto my iPhone 3G. Some work fine, but when I try to install others, it comes up with a message telling me that the app is incompatible with my iPhone? Why? And is there anything I need to do to change the compatibility of my iPhone with certain apps or something?
  • Why can't I download apps on my iPhone? It was working fine but now it says I have to read and accept the iTunes terms and conditions. I clicked agree and it still didn't work?
  • Why can't i download apps on iphone 3g? I've had a 3g before but i broke it. My brother gave me his old 3g and I can't download apps on it, it says i needed to upgrade it. So i tried, and apparently i can't? WTF IS GOING ON? AND WHY IS APPLE ***. If i have to upgrade to an iphone 4, i'm going to cut sick.(i'm poor) please help me.