problem related with audiorecorder in matlab r2011a

dear sir/mam, * following problem encountered when i was using audiorecorder function * ??? Error using ==> audiorecorder.audiorecorder>audiorecorder.set.DeviceID at 240 No audio input device found on this system.

Error in ==> audiorecorder.audiorecorder>audiorecorder.audiorecorder at 134 obj.DeviceID = obj.DefaultDeviceID;

• I want to ask can we make earpiece(hands-free of mobile) as input device.If ya then how????If not then what can i do??? *Can i make mobile phone(nokia c5) as analog input device.but how????I am using * desktop * for matlab.