China plans to track cellphone users, sparking human rights concerns
What happens when you start tracking cellphone users is that you maintain a constant history of what users are doing, their habits, who they associate with. The government can then use that history against people and for human rights reasons, that can be very politically disturbing.
China said it may begin tracking cellphone users in Beijing through location technology it hopes will help city authorities better manage traffic. But the announcement also sparked fresh concerns that the government may be using mobile technology to surveil its residents.