Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Should I Answer? - See what phone numbers are most searched and find ratings and users reviews.
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.
Phone.Report - Complete phone number report.
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.
Caller ID & Call Blocker - Caller id, block spam calls &SMS, reverse number lookup, fake call