On Android you have a choice of TI Calculator emulations see https://play.google.com/store/apps/details?id=com.Bisha.TI89Emu https://play.google.com/store/apps

On Android you have a choice of TI Calculator emulations see https://play.google.com/store/apps/details?id=com.Bisha.TI89Emu https://play.google.com/store/apps/details?id=com.Bisha.TI89... or http://www.androidpolice.com/2012/02/15/nostalgia-ti-89-calculator-emulator-finally-comes-to-android-download-it-while-you-still-can/ http://www.androidpolice.com/2012/02/15/nostalgia-ti-89-calc...