To enable high quality streams on the SHOUTcast Radio App:
1. Install the SHOUTcast Radio app from the iTunes store
2. Tap on the "Settings" icon from your home screen
3. Flick down to the "SHOUTcast" settings. Tap on the "SHOUTcast" Menu
4. Tap the switch for "Allow hi-bit streams" to ON
5. Exit out of the Settings screen by tapping on your Home button and return to the SHOUTcast App
You should now be able to play ZM-Radio in high quality streams over 3G or WiFi.