How can I subscribe the Call barring service?

1. For Free service:
a. Open the app
b. From the dashboard, click ”More”
c. Click “Services”
d. Click “Block Number”
e. Enable the service.

2. For Chargeable Service:
a. Open the app
b. from dashboard, click ”More”.
c. Click “Services”
d. Click “Block Number”
e. tab the screen up, and click “Subscribe”.