Why do telecom cards receive short messages from the Ministry of Industry and Information Technology that restrict answering calls?

Hello, 1, first check the phone bill information of your number, and then pay attention to the usage after paying the minimum phone bill; 2. After the mobile phone payment, the phone bill balance in the account can't be used normally, which may be caused by the real name of the number. Need to confirm whether this mobile phone number is a real name to register on the network;