Get calls from unknown numbers? Use Truecaller to instantly identify them and/or block them

The Address book is a great feature on a mobile. It lets you know who
is calling you before you pick up the phone. The problem is that if you
don’t have a number in your address book then your mobile won’t tell
you who is calling you. A new Android app called Truecaller fixes this
problem. When you get a call from an unknown caller the app will
automatically search for the contact online.