CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
Phone.Report - Complete phone number report.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
ThisNumber - ThisNumber helps you find phone numbers for people and businesses!
DU Caller app - DU Caller is the best caller ID app. It helps you identify unknown number and block unwanted calls.
Sync.ME - Search over 1 Billion phone numbers worldwide. Identify unknown phone numbers and block unwanted calls.