I have the .mobi files for the first two books and since they arent worth paying for (much less reading) i thought id post them for download here, and for The Enamorado Syndrome on youtube (check her out!). The way i opened these was on my phone through dropbox after i downloaded the kindle app. If you click this link from your phone itll take you to a browser page then it should give you the option "Open in Kindle app."
Fifty Shades of Grey
Fifty Shades Darker
P.s. Ill be posting some new iphone tweaks sometime soon. :D
P.s.s. Let me know if there are any books i can get for you in the comments.