Mine is rooted, thanks All, works perfectly.
Only thing is, I have some icons left from the Telenor rom. They are not linked to appps anymore. But the icons are still there. And I cannot remove them.
Everything else worked fine.
Another thing, my settings are still there. I didn't have to log in to Google again. Mail settings still correct. Even my wallpaper was still there.
On my Nexus after a wipe everuthing is gone. Maybe that's also the problem of the icons that are still there (but not the original Icons, but a generic Android icon)