ThisNumber is an international directory of phone books and U.S. phone number lookup service.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
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.
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.
Number Checker. All World - Check the telephone number to identify the country, state, region, city, mobile operator.
Sync.ME - Search over 1 Billion phone numbers worldwide. Identify unknown phone numbers and block unwanted calls.