A mobile device and method for controlling a speaker is provided. The method includes detecting when a calling surface of the mobile device changes from one surface to the other surface during a call, wherein the mobile device comprises a body, a first screen and a second screen, sound output holes arranged on both sides, and two speakers, where the first speaker faces the first sound output hole on the front surface, and the second speaker faces the second sound output hole on the back surface. The method further comprises enabling the second speaker facing the back surface, and disabling the first speaker facing the front surface if the calling surface changes from the front surface to the back surface; and enabling the first speaker facing the front surface, and disabling the second speaker facing the back surface if the calling surface doesn't change.