The rules screen allowing users to add any contact or a phone number that shall be rejected automatically. As soon as a rule is added it is set as active, note the green light, later if you would like to allow incoming calls from this number tap the light and that particular rule would become inactive.
2.1. Add Rule
Adding a rule is simple. Select "more" -> "new" and you can add a contact from your phone book or you can add a phone number directly that shall be blocked.
2.2. Edit Rule
On the main screen you will find an Edit button, it will allow you to edit a selected rule. You can only edit one rule at a time.
2.3. Activate/Deactivate Rule
A rule when added is set as Active, to deactivate it you can tap the green button on the rule and the button shall become red hence its deactivated now.
2.4. Delete Rule
You may delete a single rule or a marked selection of rules from more-> Delete.