Truecaller is an app which enables you to use it as caller id, it shows name of all the calls you make or get. It runs with wifi and internet data connection. It also gives you option to block and span calls. In this app if any call is coming from an unknown number and your internet is on the device, you can easily recognise who is calling you. Truecaller can also manage your message inbox and call logs. It has no bug in it so user can use it smoothly and without any problem. I am using truecaller app from 7 months. You can also available the facility of checking account balance and transaction detail of your bank account and rechargre or pay mobile bills also. This app is 22 mb and is available on playstore.