What's wrong with Apple's mobile phone WeChat not receiving SMS?

As the function of filtering unknown senders is turned off, the operation method is as follows:

1. First, click Settings on the mobile phone desktop, as shown in the figure below.

2. Then, in the open settings page, as shown in the figure below, click Info.

3. Then in the information page that opens, click Filter Unknown Sender, as shown in the figure below.

4. Finally, in the opened page, click the close filter unknown sender switch, as shown in the figure below.