Change the fonts in your iPhone by installing custom fonts after jailbreaking your iPhone.
So have a look at the complete guide discussed below to proceed.
So have a look at some simple steps below to proceed.

Now initiate the Cydia app and then hit the Sources tab there now.
On the Sources page, hit the All Sources option on the menu top.
Now scroll down and there look for the Fonts (BytaFont 2) option.

Look for the one you want and install it.
Now, you will see a list of fonts that you might have on your iPhone.
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