While the new developer build 7712 of Windows Phone Mango was just released, we’re frantically digging around for new features. Here’s one, the visual voicemail interface has been updated. Instead of just a play button on the left, you tap the name of the caller in the visual voicemail tab and while the voicemail plays you also get a few extra buttons for calling the person back, accessing their contact card, and deleting the voicemail. I kind of liked the look of the previous style a bit better, but this version is very nicely more functional and useful.