Google Voice is a default widget on android mobile and it uses our voice commands to perform various application and tasks.
We have to click on mic and say various commands or task for eg, call mike then the widget will recognize the voice and will perform applications according to it.
We can also get to see locations;set alarms and may more like weather, etc.We can learn more about the various tasks you can perform by simply saying OK GOOGLE.
There are also been some technical issues during voice reorganization like it take a bit more time to recognize the sound, difficulty to identify intense harsh sound and soft voice.But reduces the time of the user by simply performing the application quicker. *