Callblock - The first app to block telemarketers automatically in iOS
Have I Been Sold? - Check if your email address was sold without permission
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Optery - See the private info data brokers post about you online
SpoofCard - Disguise your Caller ID
have i been pwned? - Check if your account has been compromised in a data breach