Configure "Call Blocking" to block all but a few

I have Norton Mobile Security ver 3.11.0.2511 on a Tracfone LG L41C. It works fine. Two Questions:

(1) Does this App "LiveUpdate" itself like Norton Security on my Windows laptop, or do I need to click something to keep it current?

(2) Is there a way to configure “Call Blocking” to block all incoming phone numbers except a specified few? In other words, at the + sign, enter the numbers I want allowed through, and all others blocked?

Thank you.