If you want the iPhone 5 look without the security risks of an unverified "V2 APK," consider these safer methods:

: Avoid downloading APKs from untrusted sites that promise a "version 2" emulator, as these are often scams designed to compromise your device security. iOS 7 Supported Devices: iPod, iPhone and iPad Models

If your goal is true nostalgia and not just a visual theme, there are ways to do it, though they don't involve a simple APK install.

Finding a reliable is a common quest for Android users who miss the "skeuomorphic" charm of Apple’s classic design or need to test legacy apps. While Android and iOS are fundamentally different, several developers have created simulators and launchers that recreate the iOS 7 experience on mobile devices.