IPhone app installing trouble?

I have the iPhone 4 and whenever I download an app it takes forever to install. The downloading process is quick and easy but it takes forever to install. I tried rebooting my phone but it just starts all over. The app still hasn't installed yet. I'm running out of memory on my phone but I deleted a lot of apps and emails and other things because I really want this app. That didn't seem to help. How can I make this work so this app can install?

Try waiting? Some apps are bigger than others.

Your Wi-Fi sucks

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