Phone PIN code security is the security of the short, the principle is: the identity of each network to set a unique password and the password is stored in the central database, the same query established and reliable telephone inquiry system across the country. Consumers to purchase counterfeit labels affixed to the goods code, just make a call, enter the password on the goods, you can know the authenticity of the product, thus breaking the traditional security products to take and easy to bulk consumers easily identified against the limitations of sex. With the development of information technology, the current code is a security check method has been to SMS, Internet, etc. For inquiries, solid, said digital security [1], Po security letter security code to provide a full range of services.