I'm just curious, I think I know the answer to this one already, but, each time someone leaves me a VoiceMail (missed a call, didn't answer, whatever the case is), before I'm able to get to the VoiceMail, I get a Certificate prompt.
I recently (within the past month or so), moved to iOS 5.1.1 from iOS 5.0.1. I just noticed this started happening...the past 3 days. I don't get many voice calls anymore so it could have been something from a while ago.
I was wondering if anyone else sees a screen like this? When I view the certificate details, it's registered to an e-mail of firstname.lastname@example.org.
No new apps since iOS 5.0.1...a few App Updates.