The phone card is SIM card, also known as subscriber identification card, smart card, GSM digital mobile phone must be loaded with this card can be used. The phone card is able to store SMS data and phone numbers, which can be used for GSM network customer identification, and for voice information during customer calls SIM card use, completely preventing the parallel and call eavesdropping behavior.

Big Data, or Big Data, refers to information that is so large that it cannot be captured, managed, processed, and organized in a reasonable amount of time through mainstream software tools to help businesses make more positive decisions.