1. Unicom client does not support the business type you need to handle.
2. Your mobile phone is in an abnormal state such as arrears and downtime, which affects the handling;
3. During the billing period or at the end of the month, some business processing functions are affected. It is suggested that you can handle it after the billing period, or contact your home customer service.
4. The system is busy. If the website operation is currently heavily visited and the system is busy, you can try again later.
If you can't solve your problem after removing the above reasons, I suggest you contact the customer service of your place of origin to find out.
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