Stop receiving SMS from Google Chat
Google gives you option to stop receiving any message from any Gmail user. So if you are no longer interested in receiving Google messages, simply write ‘STOP’ in the message and send it to the system number of your carrier. The system numbers of your country’s carrier can be found here. Once you sent that message, you will receive a confirmation message from Gmail, and you will not receive any more messages in the future.
Start receiving SMS from Google Chat
You can also reactivate this service. Simply text ‘START’ to the system number and enjoy this awesome service.