Unicom 3G wireless network card can't receive SMS?

If Unicom's wireless network card can't receive the traffic reminder information, please don't turn off the internet software or unplug the network card immediately after disconnecting, or try to delete the received information or change the storage location (for example, save it to the USIM card). You cannot receive SMS or verification code for the following reasons: 1. You can check whether the mailbox is full first. If it is full, please delete some information. 2. If it is still not received after deletion, you can change the machine or card to see if it is a hardware factor; 3. After eliminating the above reasons, we can test whether it can be received in other places to see if it is the reason for the weak local signal.