The problem doesn’t begin or end with China. Security agencies in countries as diverse as Iran and Germany have been spotted responding to text messages regarding political leaders or outlawed ideologies. Much of this communication scanning is done with the compliance of the mobile phone providers, which simply consider it the price of doing business in various countries. We’ve seen this before, as in the case of Google and other portals filtering search results to suit local authorities.
Read this article from Ars Technica