The spam score of numbers is determined by how often other people report numbers as spam. This helps show which numbers are very likely spam, or just probably spam.
You can block individual numbers, or whole area codes
It's cheap though - 99 cents will allow you to use Reverse Lookup 20 times
There are 12 million users reporting spam numbers, and together they have formed a large database of spam numbers
The IRS scam, Microsoft Tech scam, Grandparent scam and many others are blocked by Call Control
Numerous users are reporting that the app turns off cell signal to drop calls, leaving the device disconnected from the network for a few minutes after each dropped call.
You can set who to blacklist, and you can blacklist any number