Number Checker. All World!

Find a person by a name or phone number worldwide for free using Truecaller. Also available on Android, iPhone, Nokia Symbian and Blackberry.

We've all been there. You've missed a call on your phone from an unknown number. You wonder if you should call back, it could be important. Or maybe it's yet another telemarketer ringing to sell you insurance. That's why we created CallerSmart. CallerSmart is an innovative free app for your iPhone that helps you identify mystery numbers and block unwanted callers. How? By bringing you an up-to-date user-generated phone book that's supported by an ever-growing community of passionate users. Thanks to a revolutionary game system which rewards you for your contributions to our phone book, together we're now able to outsmart unknown & unwanted callers. As our users add information to more and more numbers, our database continuous to expand- CallerSmart can only get better! »

DU Caller is multi-lingual, and with the world’s largest phone number database, you can use it wherever you are!

Sync.ME identifies unknown phone calls, warns you from annoying spam calls, and adds a caller picture to your contacts from Facebook, LinkedIn and Google+!

WhosCall is a reverse Number Search, with a global number database of over 600 million entries.

Retro Sleuth provides background information from any number that you want to search.

You can use this tool if someone calls you and you aren't familiar with the phone number, or else your caller ID doesn't provide you with the name of the caller. With WhoEasy you can lookup cell and landline phone numbers from their real time directory, and get results fast. They will return the name, address and more about who owns the phone number you are searching.

Complete phone number report. Get a phone GPS location heatmap, mobile operator, city, state, comments about any phone number.

“Call Notes Is a Cheat Sheet While You’re on the Phone.” Gizmodo

Should I answer the call? This question can come into a mind of every person who sees an unknown incoming call. Each of us had (or will have) the opportunity to face the unsolicited call, telemarketing campaign, advertisement or some kind of fraud call. How should we find out that the calling number is harmless and answering it will not cost us tens of minutes of precious time or a significant amount of money?