A mobile phone is provided that is configured to obtain information of one or more external wireless devices operatively coupled with the mobile phone. In response to a call connection event, when the mobile phone is operatively coupled with one external wireless device among the one or more external wireless devices, and if obtained information regarding the one external wireless device indicates that the one external wireless device does not include a microphone, an audio input is obtained via the built-in microphone. In response to a call connection event, when the mobile phone is operatively coupled with one external wireless device among the one or more external wireless devices, and if obtained information regarding the one external wireless device indicates that the one external wireless device includes a microphone, an audio input is obtained via the microphone of the one external wireless device.