What is a good app for iphone to read books (pdf files)?

My iphone isn't factory unlocked so i can't install iOS 6. Which also means i can't download some apps like iBooks or Goodreader. I was wondering if someone can tell me a good app that i can download that allows me to read books. I have a 3gs thats running on 3.1.3.

This is coming from an Android experience but I believe the Kindle app can read PDF files as well as their native format (.mobi files).

I know Kindle Books can read on your iphone 5. This read apps is now the best popular use in our life. For the details tutorial on How to Read Kindle Books on iPhone 5, iPhone 4S, iPhone 4 http://www.ipubsoft.com/iphone/read-kindle-books-on-iphone.html You can see this link help you.

I had a lot of questions about applications when I first experienced my iphone. I know you will find a lot of interesting articles answering that problem on this site and it is all free too.

  • Why can't I hide or delete books on the Books app on my iPhone? I uploaded some free books to read on the app and after a couple chapters wasn't interested in them. I tried to delete them and they didn't go away. I tried to hide them and they still wouldn't go away. Now when I click "edit" it greys out the delete and hide options completely. I'm aggravated because I can't get rid of them no matter what I've tried.
  • What is the easiest way to transfer pdf files that were emailed to me on my iphone? What is the easiest way to take pdf files that were emailed to me on my iphone and transfer them to my laptop (Please note that the laptop has no internet connection, the iphone does)? I've searched all over and I don't seem to get a simple and clear set of instructions as to how to do it. I even looked for youtube videos but they all pretty much show it the other way around.
  • Read 50 shades darker pdf file on my iphone? I read the first one on this pdf file on my iphone which was very convenient i found a few pdfs of the next book but they don't enlarge on my iphone any links or anything?
  • My Samsung Portable SSD T5 500GB is damaging my pdf files? At my job I work with a lot of PDFs and I do all my work on either a flashdrive or icloud so I can have access to it across device. I bought my SSD hoping to help me do that even better but now it seems to be damaging my pdf files. I would do some editing one day. Eject it, unplug and then the next day some of the pdf files become damaged. I'm using the SSD cross-platform Mac and Windows. It seems to be only be happening to pdf files