Truecaller is a great application. It has been in the market since 4-5 years. A person can get many calls and at times he/she does not know who is calling. At times it might be advertisment, some prank calls and maybe the person you know might call from a different number. It would be very convenient to know who is calling you when the incoming phone number is not saved in your mobile. Truecaller makes this thing possible. All the users of Truecaller have to create an id and the application accesses their contacts. Thus, in this way there are maximum chances that you can know the person calling you. There are also features that help you to block all the advertisment phone calls and all prank calls, thus providing you relief from all the annoying and disturbing calls. The application is too easy to use. You need to make an id and it depends on you if you want Truecaller to access your contacts. The installation is easy because all you need to do is download the app from playstore and it will be automatically installed. The service and support is also great. I recommend this application.