S Voice is a discontinued intelligent personal assistant and knowledge navigator which is only available as a built-in application for the Samsung Galaxy S III, S III Mini, S4, S4 Mini, S4 Active, S5, S5 Mini, S II Plus, Note II, Note 3, Note 4, Note 10.1, Note 8.0, Stellar, Mega, Grand, Avant, Core, Ace 3, Tab 3 7.0, Tab 3 8.0,Samsung Galaxy Express 2, Tab 3 10.1, Galaxy Camera, and other 2013 or later Samsung Android devices. Wikipedia