I think it's quite common. I read on my cell phone almost every day when I have small periods of time and it's convenient. I definitely read more on my phone since I upgraded to the iPhone 6S with a larger screen. It's great that the phone apps will easily sync with my e-ink readers or my iPads. I do read more on my iPhone and tablets than I used to because I have a Scribd subscription too and one of my libraries switched to 3M. It's more convenient to use their 3M iOS apps than download ePub files and transfer.
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