I try to log into SuperUser from my mobile phone, but it fails. I can easily browse the pages of SuperUser, but when I click on "login" and then select my OpenID account provider, it doesn't work. Is it because of the phone? My mobile phone is Samsung C5212.
Hmm, I am not sure what OS this phone is running.
However, you need a fairly advanced mobile web browser to use SO. I know that Windows Mobile 6+, iPhone (all versions), Android (all versions) work OK.