I read it all, i tried it all but nothing works.
I want to center everything on my iphone. The Header, the Posts, the Footer.
Is this possible?
Thanks.

Try the mobile stylesheet on the Lazyest Stylesheet plugin.

go to MTO->Export Import and copy your settings to a file then attach the file to a reply

Okay here is the file.

That file is not a valid export - did you save it with a text editor or word processor?
and are you using a language translation for WP?

I saved it with Textedit on my imac.
I am using a german wp version which was preinstalled by the hosting company.
I attached a new file.

That's better but I see no problem using those settings. I'm looking at it on an iTouch and the site looks fine.

Try disabling all plugins.

I´m not using any plugin.
On the foto you can see what it looks like on my iphone 4s.

chane your site tiele to 'Hamburg - Hoheluft' and see what it looks like.

or change mto->CSS Files->various.css and add a font size to the section

@media only screen and (max-width: 959px) {
    #sitetitle {
        display: table; /* center without providing width */
    }
}

I tried different font-sizes but it stays the same.

Send another export