Using the Zoom.us web portal:

1. Sign in to the Zoom web portal.

2. Click Phone.

3. Click the Settings tab.

4. Scroll down to the Others section.

5. Go to the Blocked List option -> click View or Edit -> click Add then enter the number -> Save:

Using the desktop Zoom app:

1. Once the call comes through, click on the Phone tab.

2. Click on History, hover on the number you want to block and you will see phone and ellipses icons, click the Ellipses.

3. Click Block Caller and select the reason why:

Using the Zoom app on iPhone:

1. Once the call comes through, click on the Phone tab on the bottom of the screen.

2. Click the History tab on the top left corner -> hover on the number you want to block -> click the Ellipses icon.

3. Click Block Caller and select the reason why: