How to change the font of the text on my iPhone 4 without jailbreak?

How can I change the font of the text on my iPhone 4 without jailbreak?

This can't be done w/o a jailbreak

There's not a way to do this yet, but hopefully if enough people request this apple will add the option to do so.

If you are running the latest IOS, you can only change the font size on some functions, and you can choose BOLD, which makes it slightly easier to read. That's it, without Jailbreak.

Nope.