My son was on his iPad mini 2 and he says that voices (that we not associated with any aps he has) started saying numbers. He is convinced that someone has "hacked" into his iPad. He was playing Call of Duty, World at War. The sounds are not associated with the game, as far as DS thinks. What, if anything, could this be? (To add to the paranoia, he says his iPhone made a strange noise at about the same time.) Thanks.