Can I read books on my iphone without Wi-Fi?

I'm going to Mexico and I need to read these books over the summer. I would bring the actual books but it would be easier if i could just read them on my iphone, its more lightweight. However where I'm going there's no Wi-Fi acess at all. If i download these books will I still be able to read them?

You can on the kindle app by amazon. You have to buy the books on amazon though and somehow get them onto your phone

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