K40 can't receive any short messages.

First of all, we need to determine the reason why the message can't be received.

The reasons are as follows: 1. Mobile phone arrears. 2. The storage of the mobile phone is full, so you can't receive messages. 3. The location of cell phone signal is very poor. 4. There is something wrong with the number setting of the SMS center. 5. There is something wrong with the mobile phone hardware.

We need to eliminate the above reasons one by one and find the correct problem in order to solve the problem of not receiving SMS.