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Large-screened phones can be useful for working with office documents, and Quickoffice Pro is a great way to do so. It can view and edit MS Office documents (Word, Excel, PowerPoint) and is a full PDF editor.
Google bought Quickoffice last year, and is in the process of integrating it into Chrome and Chrome OS. The Android app is a full version of the Quickoffice suite.
Users dealing with the lack of MS Office on Android may find that Quickoffice Pro can fill the void.