ThisNumber is an international directory of phone books and U.S. phone number lookup service.
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Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
You've Got Spam - A new tool that lets you spam back the spammer
WhosCall - WhosCall is a reliable caller ID app whose popularity has led to its adoption by many users including international media. You can now manage the numbers calling you regardless of whether they are part of your contact list or not... read more.
Callwarden - Go to war on spam calls 📵
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
RoboKiller - A paid application for iOS and Android users which blocks and pranks spam callers, such as scammers.