I always struggle with opening OpenOffice.org open format documents on my iPhone – Apple doesn’t have this as a standard format that other applications can use.
I don’t know of any applications that can edit Open Document Format files, however recently I downloaded the IBM Lotus Symphony Viewer. This works a treat in at least allowing me to view the data inside, which is certainly better than having to email someone and ask them to save into a different format (PDF or the Microsoft equivalent) just so I can see the data in the file.
And thankfully, it’s free. 
Perfect for iPhone! Many thanks!
Thanks, very helpful!