Traffic control 12 13 always shows whether there are unread messages. What happened?

1. Failure reason: 1. There may be compatibility issues. 2. The cell phone signal is not good. 3.SMS storage service is not turned on. Second, the solution: 1, restart the phone, but it is recommended to turn it off and then turn it on again. 2. Check whether the mobile network is normal, because it can't be opened if the information is not received completely, especially if the signal or mobile phone is not very good. 3. Check whether the SMS storage service is abnormal and whether it is opened normally. 4. If only a few short messages can't be opened, there may be compatibility problems. Suggest that the other party try again. 5. If all the short messages cannot be opened, please try to clear the data after backing up the short messages. 6. Check whether there is a new version of the machine system and try to upgrade the system. If the problem still exists, please take the purchase invoice, maintenance card and machine to the service center, and the professional after-sales engineer will help you test it.