Take a look at the screenshots below and attempt to read the text without zooming in at all.
It cant just be me who finds this difficult to parse.
I Know Its Not Easy
I understand enough about game development to know that its challenging work.

Traimak_Ivan / Getty Images
I do get that.
Theres no “simple” when adjusting anything under the hood in a video game.
Bumping the text up a single font size could cause dialog or menus to clip outside their intended boxes.

Heck, it could invert gravity for all anyone knows.
Games are weird and wonderful like that!
Perhaps consider adjusting font sizes for mobile phone ports if your game is already on other platforms.

If feasible, maybe even consider utilizing tools like iOS 10s baked-in font Accessibility options.
Could you possibly try testing your games on average-sized phones during development?