How to change the keyboard anf all font on a iphone 4s without jailbreaking it?

I have an iPhone 4s and I want to change the font on my keyboard and the names on my app icons and everything else, how would I do that without jail breaking it, I've tired jailbreaking it but it said it don't support what I have. I have 7.1.2.

Sell it, and buy an Android phone that lets you do what YOU want to do.

With upcoming iOS 8 you will a lot more options for changings fonts.

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