How to put an ebook on my iPhone?

I have a book with these three extensions,
.epub.lit.mobi

I would love to put it on my phone so I may sit outside in this lovely Florida weather and enjoy a read.
If anyone could tell me how to get this book with these file extensions on my iPhone step by step that would be most appreciated! Thank you!

iPhone 4 by the way, running on iOS6

Added (1). Okay I've got the apps down, now how do I take these files off my computer and put them onto my phone then proceed to open them with these apps?

EPUB is the most standard eBook format, MOBI is Kindle format and lit is MS format.

1. You can use iBooks app to read EPUB books. Go to apple app store to download it for free if iBooks is not preinstalled on your iphone.

2. Install free Kindle for iPhone app to read MOBI books.

3. Stanza supports lit files, but it has stopped updates.

This guide may help you in details.
http://www.ebook-converter.org/4-ways-to-read-downloaded-books-on-iphone5.html

You can use software like epub transfer
I used it always.
http://www.softpedia.com/...27718.html

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