Unable to download application error on iPhone?

I got a new iphone 5 a week ago and till today it worked perfectly but when i was downloading an app it was like ''UNABLE TO DOWNLOAD APPLICATION'' please help!

Perform basic troubleshooting tips as you can see here:
http://appletoolbox.com/2012/07/error-1004-unable-to-download-from-the-app-store-itunes/

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