Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Number Checker. All World - Check the telephone number to identify the country, state, region, city, mobile operator.
Truecaller - Find a person by a name or phone number worldwide for free using Truecaller.
Cute Web Phone Number Extractor - It extracts valid phone, fax number, and mobile numbers from a search engine, websites and files.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
ZabaSearch - Find people free with Zabasearch directory engine that includes free people search, reverse phone number lookup, address lookup, and more.