In this video from iPT2gGeec we learn how to change the font on the iPhone. Your phone needs to be jailbroken. Open up Cydia and search for Fonts. Select Font Swap. Install and confirm. Once loaded, go back to the home screen. It requires no reboot. You will see the Font Swap icon. Click on that. You can change dialer fonts, lock clock fonts, notes font, and system fonts. You can select any font listed that you want to change it to. When you change the font, then restart your iPhone and you will see the change has taken place. If you want to change the fonts back to the original just click Default in the fonts menu.