How long will Unicom's SMS details be delayed?

48 hours. According to China Unicom's information, when Unicom's user number can't receive SMS due to arrears, the system will keep the SMS list for users for 48 hours. If the user does not recharge the phone within 48 hours, the SMS list saved by the system will not be sent again. Detailed list refers to the sending records of short messages and multimedia messages generated by mobile phone customers when using peer-to-peer services. Through the detailed list, the sending time and cost information of SMS and MMS are displayed, which constitutes the SMS and MMS cost of mobile phone customers.