I made a mobile version sometime ago. http://ihackernews.com

There are plenty on iOS Apps for that, like: https://itunes.apple.com/us/app/hackernode/id473882597?mt=8

http://newsyc.me/ is the best iPhone app I've found for Hacker News, highly recommend it over just using Safari.

Use a different front end for IOS: http://hackerwebapp.com/

just use a different browser that let's you set your own font size.