RANDOM.ORG - RANDOM.ORG offers true random numbers to anyone on the Internet.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Random Number Generator - Randomly generate integers or floating point numbers within a given range and specified discrete or continuous statistical probability distribution.
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.
Randommer - Generate random number, telephone numbers, text, hashed and social security numbers
CallerSmart - CallerSmart is an application that is basically used for the purpose of looking up mystery phone numbers for free.