1, consult the phone bill balance of the mobile phone card to see if there is any arrears;
2. Correct the information center number, first check whether the mobile phone information center number is correct (compare it with similar local cards or consult the operator to confirm the message center number);
3. Compare and observe the changes of SIM card and different time periods;
4. Try to restore the factory settings of the backup data;
If the above methods fail to solve your problem, please take the purchase invoice, warranty card and mobile phone to the nearest customer service center for testing and handling.