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Goodreader, and you can even use the Lite version... the only limitation is you can't have more than 5 pdf files on your device at one time.
 
i must agree with the ans
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We do recommend you to look at ReaddleDocs,
not only are you getting a powerful PDF reading tool, but a complete file management solution for iPhone.
 
I'm a fan of ReaddleDocs. A very good (best I've seen) PDF reader and also file management, including email attachments.
 
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