I am with AT&T, and my calculator talks back as well. After much searching, I was able to get it to stop. You have to go into the Settings-Device-Sound-Volume, and the 2nd category down is "Music, video, games and other media". If you turn this volume all the way down, the stock calculator does not talk back. However, everything else listed is silent until you raise the volume on one of them. Then the calculator will talk back again. Very annoying, hopefully will be fixed in an update, and soon!