Callblock - The first app to block telemarketers automatically in iOS
You've Got Spam - A new tool that lets you spam back the spammer
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Castle - The easiest way to protect your users from getting hacked
SpoofCard - Disguise your Caller ID
RoboStopper - Block spam calls or get paid for them wasting your time