Truecaller app is an app that help people to find name and other important contact information of the caller to your phone number.
Using it for a year now and working very well to see who is calling within seconds.
It help people to know who is calling from the unknown numbers at most time.
It is userfriendly as it automatically show the contact info whenever anyone call you.
Install info is easy and premission needed here but it will help in the call details.
You can also find contact information by search.
Overall , a good app to use for phone number info.