Downloading book PDF's to iBooks?

I'm having trouble with trying to download The pdf for one of my books to my phone has anyone else tried this?

works fine on my phone, which book and do you have enough storage space available?

Renai Sample. I tried to download the pdf to iBooks on my phone but it didn't work

Try dl it in another folder or off the phone and transfer.

hmmm.. I tried to download it to my ipad and it seems to work in ibooks.. then again I'm using IOS 5..