Allowing filter allows calls and SMS only from the added contacts.
How to use allowing filter
•Enable the Contacts option to accept calls and SMS messages only from your contacts.
•Create your own lists.
1.Open allowing filter.
2.Tap the 
icon.
3.Specify a list name.
4.Add contacts. You cannot save an empty list.
To add contacts to the list
1.On a screen with the necessary list, tap the icon. Select one of the options:
Contacts to add a contact from your contacts on your device.
Call log to add a contact from your recent calls. Available only in the version downloaded from the website.
SMS log to add a contact from your recent SMS messages. Available only in the version downloaded from the website.
New contact to create a new contact.
Import contacts to import a contact list that was saved earlier.
2.If necessary, edit name and phone for each contact. You cannot edit a number added from your contacts.
To save contacts from a list to a device
1.Select the necessary list.
2.Tap the 
icon in the top right corner.