CallApp is a Free Caller ID and Call Blocker app that allows mobile users to block phone calls, identify telemarketing calls, record phone calls, blacklist unwanted callers and much more. CallApp is one of the most comprehensive caller ID apps with the ability to identify over a billion unknown callers and update your contacts with full info from social media platforms.
RealValidito - Phone Validator | Free Phone Number Validation & Phone Number Lookup Service | Realvalidito
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Numverify - Global phone number validation and lookup API
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.
Clearout Phone - Phone Number Validation - Accuracy Guaranteed, GDPR Compliant, Abuse Phone Number Checker, Real-Time API 99.999% Uptime - Free Trial With 100 Credits!
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.