Jennifer Maloney, writing for The Wall Street Journal last week on the rise of phone reading has some interesting stats regarding the iPhone 6:

Since the release of the bigger, sharper iPhone 6 and 6 Plus last September, Apple has seen an increase in the number of people downloading books onto iPhones through its iBooks app. Some 45% of iBooks purchases are now downloaded onto iPhones, an Apple spokeswoman said. Before that, only 28% were downloaded onto phones, with most of the remainder downloaded onto iPads and a small percentage onto computers.

This increase isn’t limited to Apple’s iBooks app:

Amazon has also noted the development. Among all new customers using Kindles or the Kindle app, phone readers are by far the fastest-growing segment, an Amazon spokeswoman said, declining to disclose figures. Among those who use the Kindle app, more people now read books on the iPhone 6 or 6 Plus than on any other Apple device, even the popular iPad Mini, she said.

Note how Apple said “downloaded onto iPhones” and not “entirely read on iPhones” – but still, it makes sense for people to read books (and I would assume, web articles) more continuously and ubiquitously on an iPhone than an iPad, especially thanks to the iPhone 6 and 6 Plus.