Siri is a significant improvement in iOS 7, not only the UI changes, now you can also change Siri’s voice from Female to Male just by switching Settings -> General -> Siri -> Voice Gender to Female or Male. iOS 7 also added a new Control Center, which integrates various systems toggles and music controller, just swiping your finger from the Screen bottom to call it. You can also control these toggles: Bluetooth, Wi-Fi or brightness etc. with Siri. Twitter, Wikipedia and Microsoft’s Bing also integrated into Siri…
Overall, Siri become more intelligent, but now some users encountered a problem that Siri not working normal since they updating iOS 7 beta 4.
Here is a simple tips for your fixing Siri issue.
Now re-call Siri, it works fine again.