Shanghai residents can easily unsubscribe to annoying commercial text messages by replying “0000” from Dec 1, Oriental Morning Post reported.

Users of the three mobile operators — China Mobile, China Telecom and China Unicom — can reply with the text message to housing companies and training course promotions, of which the numbers usually begin with 106, and will no longer receive messages from them.

Shanghai is the first city in the country to give mobile phone users the ability to decline receiving such text messages.