Portable web browser to read books on. That’s all I use mine for, except for the occasional text message / phone call. I got by fine for a long while with just my laptop, but reading on my phone is just a lot more convenient in a lot of cases. Like when you’re walking, or running, or standing, or laying down. It’s a pain in the ass to read from a laptop while walking, I’ve almost dropped the poor thing too many times to count.