Apple's Siri Let's Anyone Use A Locked iPhone 4S

Want to send e-mails and texts on a passcode locked iPhone 4S? Just use Siri. Wow, this has to be embarrassing. I borrowed a passcode-locked iPhone 4S from a colleague here at Sophos and, with his permission, was able to write an email, and send a text message. If I had wanted to I could have meddled with his calendar appointments too. All without having to enter the passcode. I'm sure you can imagine some of the ways this could potentially be abused.