QuickOffice is freaking expensive. It's available on iTunes app store for US$19.99. If you do not need to edit, you can just go for some cheaper app like MobileFiles or AirSharing. You can upload your pdf/doc/spreadsheet/ppt by wifi (your comp and iPhone must be on same network) or by USB if your phone is JB.

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Added on May 26, 2009, 10:00 pmYou can find it in the software itself after uploading. I've AirSharing installed on my phone. I believe they are they same.

This post has been edited by kaika: May 26 2009, 10:00 PM