[pawelkadysz]

Minimum photo size is 1280px (width). As far as I know iPhones have 8MP cameras. Unless you crop it to 50% the size it should work just fine. Also, there's an iOS app coming in a couple of weeks which will make uploading from iPhone much, much easier.

[wonnage]

Ah, I had taken it in portrait orientation. Maybe taking the longest edge would make sense?