How do you create a ebook?

I think Adobe has a software that lets you create ebooks. I think it's not for free. I create ebooks too but just for mobile phones. I use MJ bookmaker which can be downloaded online for free and I make ebooks through it but for mobile phones only.

I always read ebooks in my mobile phone and most of the books I wanted can't be downloaded in Java file, which is usually the required file type in most mobile phones. So many would really appreciate it if you'll make an ebook of your story for mobile phones too. I make the mobile ebook version of the novels through a computer software Mjbook Maker. I only need a .txt file of the story/novel, upload it in the software, edit the format of the appearance of the ebook and voila! I have an instant ebook. You must have an Ms Word or document files of your story and then you could convert it to various ebook files. www.convertfiles.com had been most helpful to me when I'm in need of converting file types from one to another.