How to not hack the phone settings so that the other party can't call in?

How to set up a phone that doesn't have a black screen but can't get in, the specific steps are as follows.

Using mobile phone: Huawei Mate 30 Pro

Device version: Android 10

Use software: telephone

1, turn on the phone first, as shown below.

2. Click Settings at the top of the page, as shown in the figure below.

3. Click the call rejection message, as shown in the figure below.

4. After entering the page, click Select Reply SMS, as shown in the figure below.

5. In the final quick reply, click OK, as shown in the figure below.