IPhone won't update iOS 7.0.4?

The settings app shows I've got an update which is iOS 7.0.4 but every time I click "download and install" it tries to download for around 5 minutes then comes up with the message "update failed to install successfully". This has happened on multiple occasions and I've tried resetting my phone and clearing some memory space though I don't see how either of those options would work in the first place! Any suggestions?

Don't updated ios7 I did on my ipad and its ruined it I had to delete a hole load of my songs and apps to get it and it's no different the the normal one just a different layout

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