If you have been using an Android phone for a while, you should have Truecaller installed on your phone by now. If not, do it now ! Truecaller is the best way to identify who is calling you, even if you do not have the no. in your directory. They boast of having a database of over 85 million nos. from all over the world. It not only goes online and looks up the no., it also displays the name on your screen even before you pick up the call. After the call is over, you can even save the no. directly in your directory. The best part is that you can mark a no. as spam (to get rid of those pesky calls) and the no. will be automatically blocked from then onwards. It will also display if others have marked a no. as spam, helping you decide whether you should pick up a call or not. A must have utility – you will wonder how you managed without it for so long.