When you open Unicom's idle traffic and reply to the SMS to confirm the order, it always shows "The system can't accept the details for the time being, please consult the local business hall".

This may be because the Unicom system is busy or your number does not meet the processing conditions. At present, Fujian Unicom's free-of-time traffic package in the province is only for 2G mobile phone users and 3G mobile phone users who have not applied for 3G provincial traffic package (excluding 20 yuan prepaid package). I suggest you check whether it meets the requirements first. If it does, you can try it another time. At the same time, if your local free time traffic packet service has been updated, your original SMS instruction may not be processed. I suggest you check whether the SMS command is correct.