Google is currently offering an extra 10GB of free storage on Google Drive for two years for anyone that downloads the Quickoffice app. Quickoffice is a free app available for both Android and iOS (iPhone) phones. The app will allow you to open files anywhere.
While we’re on the topic of free stuff, if you sign in to your Google Account from the new Quickoffice app for Android or iOS by September 26, 2013, an extra 10GB of Google Drive storage will be added to your account for two years (look for it in the next few weeks). So don’t let your hardware or software differences get in the way of true collaboration -- download the new app and start working together today. (Source: Official Google Drive Blog)