New ios update won't show up in my settings?

Ok so i heard about ios 7 and i want it so bad but whenever i go under general and then software update it doesn't show up? I currently have ios6 and i have an iphone 4s!

Your iphone may be to old. But It might also be that the update isn't available yet

I've downloaded it but it will not install? Anyone know why?

Your phone is old. It's probably to slow to run the new software, sorry.

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