Hi Volkan,
When I test on demo.mojoportal.com using IE 8 on Windows 7 it works fine for me. After you create the survey you need to add pages to it and add questions to pages and then make it the active survey for it to appear on the page.
It would not surprise me if there are issues editing a survey with iphone, however I'm unable to test that scenario right now, I dropped my iphone into a glass of water last week :-(
Best,
Joe