Not all fonts easily, because XF uses px''s by default for font sizing there's no method of increasing this for mobile.

This is something I'm working to address for an update just as a heads up though.
For what it's worth... you can always use responsive queries to increase specific areas.
@media (max-width: @xf-responsiveWide)
#XF .css-selector { font-size: 20px; }

Pre-Sale Questions

If you have any questions or concerns you want to ask before you make a purchase don't hesitate to use one of our multiple support channels for your convenience.