I've tried different plugins and hacks to enable the Safari Reader button on the iPhone's Safari browser without luck so far.
Actually there is no better way for best reading experience on a smartphone than with Safari's Reader function.
If you don't know what Safari Reader means, here's an awesome blog post about it: http://mathiasbynens.be/notes/safari-reader
If it's not easy possible to active it with WordPress, it would make more sense to me to write an own blog system.
Thanks a lot for any ideas!