with is application installed in the mobile we can able to control the electrical devices with some electronics components such as switches .... we need to install the GPS module to the electrical device with a sim  ..... after the mobile application gets installed in the mobile all the thing is you need to tap the button and speek such as LIGHTS OFF or LIGHTS ON  then with the help of the microphone which is present in the  mobile the speech gets recorded and nd displayed on the screen, the message is sent only when the text matxhes to the given text in java code i.e LIGHTS OFF , then it will send a message to the gps module with the another sim hence the switch gets activated or de-activated .....