I got notification of IOS7 new version V7.1. I have installed on my iPhone 4S. As I am developer my iPhone 4S is not detected in development mode in Xcode 5 SDK. When I open
You need Xcode 5.1 to get access for iOS 7.1. Check the Xcode release notes for more info.
You can update to the latest version of Xcode using the OS X App Store application.
Edit:
App Store link
Developer Center link