Why does my iPhone keep saying this

I'm trying to download the GTA 3 app and its a little over 400mb. I have 1.2gb free of space (more than enough) why won't it download! I've already deleted a ton of apps and pictures and still nothing. I'm getting mad! :/

Its need double to install, then after it installs it will free up the space.
download in itunes on a PC and sync your iphone

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