Truecaller is very useful app for identifying unknown contact, if one doesn’t know about any contact number and want to identify who the caller is than it is useful app for identifying unknown contact.This app will show the identification of the caller which is saved in their database.
It cannot tell the identification of caller if their database doesn’t have any information regarding the contact number.Using this app one can easily search for any phone numbers, to search for any phone number one has to be registered user of truecaller.If someone has search your phone number or viewed your profile then you will get notification that - the "name_of_person" has searched your phone number through truecaller.
This app can also be used for blocking unwanted callers.It can block certain series phone number, phone numbers having certain area code or phone numbers of whole country.It is available for almost all the platforms - android, windows phone, apple, symbian and other platform.Overall it is very useful app, one should have this app.