Samsung note3 N9009 Card 2 (China Unicom) always can't receive short messages. Why? The interception of LBE has been closed. Signal 4

There are several reasons for not receiving SMS: 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; After eliminating the above reasons, you can try to test whether it can be received in other places to see if it is the reason for the weak local signal. If the above problem does not exist, it may be related to the network function, please contact the local manual customer service to deal with this problem.