The use of robots in the present day has moved on from industries to the normal day to day life. In such a scenario a healthy interface between humans and the robot is of dire need. The use of voice commands to control a robot is much easier for domestic as well as industrial users. This paper proposes the use of an android mobile to control a robot via voice commands. As an example a real mobile robot system is presented. Because the process of speech recognition depends on received sound quality, a comparison of voice commands transmitted via different cellular phones was performed. This paper includes the results of this compare son. © Research India Publications.