Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Phone2Location - Caller ID, phone number tracker, call blocker, contacts location, works offline
PhoneGenerator.net - Generate random phone numbers for all countries using the mobile phone generator. These numbers are fake, but they are built using the validations of telephone numbers.
Call Notes Pro - Call Notes Pro helps you to identify who is calling you. You won’t have to ask yourself “who is it?
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
FCorp ID Book - ID Book is a handy, easy to use application specially designed to offer users a simple address book.