I just saw
this article [news.com.com] over on CNet and thought to myself, 'what a great idea!' The gist of it is that the Chinese have a problem with people defacing things with ad stickers that use a mobile phone number as a contact. The government then spams that number with prerecorded voice calls several times a minute making the ad essentially useless. These sticker ads are a problem in a lot of urban areas in Japan as well and it is usually a mobile phone number on the ads. I wonder if this will catch on in Asia...