It gives you information about callers who are beyond your address books like marketers and spam callers.
It can also block unwanted calls, preventing you from being disturbed with unnecessary call rings.
The app is becoming quite popular with dozens of millions of users.

Screenshot
It is quite efficient in identifying and eventually blocking unwanted calls and in matching names and numbers.
Now before installing it right away, read this article to the end.
Your decision might be slightly more complex.
The app runs onAndroid,iOS,Windows Phoneand BlackBerry 10.
It requires internet connectivity to run viaWi-Fiormobile data.
The interface is quite simple and intuitive.
Features
TrueCaller works first and foremost as a super-powerful caller IDapp.
It tells you who is calling, whoever the caller might be and wherever they might be from.
You will no longer see things like “Anonymous” or “Private Number” on an incoming call.
You will also be saved from the disturbing commercial calls or calls from wet blankets.
More than just identifying unwanted spam callers and telemarketers, TrueCaller can also block them.
you’ve got the option to also build a blocklist to add to the already existing spam list.
you’re able to choose to be notified of their calls or go totally un-notified.
TrueCaller allows you to search for any name or number.
It may not be accurate in certain cases, but it is in most cases.
It is important here to underline the name to number rendering feature which is quite new and revolutionary.
It works like a phone directory, but with much more power.
It actually gives you what the phone directory will not.
This has brought up privacy concerns, which we discuss further below.
But if you mind your privacy and that of others, read below.
Many found their numbers with strange nicknames besides theirs' and pictures of themselves they never knew existed.
Imagine what ill-intentioned people can do with that.
An important question here is how TrueCaller works.
The crawler actually also crawls through VoIP and instant messaging systems likeWhatsApp,Viber, and others.
TrueCaller claims that the contacts they take are unsearchable by users, which is seemingly true.
This is because data is extracted from people’s address books, which are often not up to date.
But the greater concern here is that your contact information is available up there for anyone to search.
For many people, this is a non-issue, especially given the power the TrueCaller app comes with.
On the other end, privacy hardliners will have a no-no for this app.
This without your permission.
Maybe so for all contacts in your contact list.
The good news is that you’re free to unlist your name from the directory.
you’re able to do so by quickly filling the form on the Unlist Phone Number page.
Note that unlisting your number also requires you to stop using the app and deactivating your account.
you better completely move out of the system.
But there, you’re able to only enter number, not names.
Once you unlist, your number will be absent from the search results within 24 hours.
But will it be completely erased?
Where has it been shared with?
We don’t know.
On the other hand, you may want to shun the system altogether and unlist your number from it.