Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Bluff My Call - Bluff My Call app provides features to allow users to make prank calls to their friends and family members by changing their voice and caller ID in a few simple steps.
CallApp - Free Caller ID & Call Blocker app that allows mobile users to block phone calls, identify calls, blacklist unwanted callers and much more.
True Contact - True Contact is a special caller ID revealing app for those smartphone users who want to resolve their issue of unknown and unwanted calls.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
TrapCall - TrapCall is an application for the purpose of getting the caller IDs and unmasking the blocked calls.