Bandai Namco and Yahoo! released the Idolmaster voice package for the iOS version Yahoo! Car Navigation system. The Android version released last week in Japan and now you can get the iOS edition for free.
Just like in the Android version you can choose Rin Shibuya, Uzuki Shimamura and Mio Honda’s voice in the application. You can download the basic application from here: https://itunes.apple.com/jp/app/yahoo!kanabi/id890808217