Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.

ReportedCalls - ReportedCalls helps people search and identify potential spam and scam phone numbers.

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.

Reverse Lookup - This iOS App helps users identify the caller based on the phone number. If any user receives a phone call from an unknown number, they can use this App to look up information on that caller.

CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.

USCallers - USCallers.com is a free, reverse phone lookup service for both cell and landline phone numbers.