I purchased iWork for my iMac desktop last year. I'm just learning how to use iCloud, and wondering if I have to purchase another iWork for my iPhone 5. Would like to be able to access files created in Pages, Numbers and PDF files, currently on my desktop, with my iPhone. I'm planning on getting an iPad soon, so I assume the process would be the same? How do I go about getting Pages, Numbers and Adobe Reader on my iPhone? Thanks for any help!