I'm not sure if there are any typography gurus here that might be able to answer this question, but I don't know where else to look. I'm looking to add text hyphenation into one of my projects, and after doing some research, there are a few curious points I am unable to connect. I want to know when and when not to use hyphenation, and if screen width is a major factor in this decision.
I'm curious as to why in Apple's iOS Safari "Reader" feature (where you tap the Reader button and it converts any web page into a nicely formatted reading friendly page), they do not use hyphenation on the iPhone, but use hyphenation on the iPad Safari Reader. So on the iPhone, they do use hyphenation in the iPhone iBooks app, but do not in the reader app (so I'm unsure as to if this has anything to do with screen width.
iPhone Reader in Safari (no hyphenation):
iPhone iBooks (hyphenation):
iPad Reader in Safari (hyphenation):