It is useful to each and every individual.
If the data connection is in on condition at that time if we get any calls the truecaller application shows the name of the person for whom the sim is alloted.
And it is very useful for ladies, weather they are ready to take that call or not.
At some point I got some fake calls which I was not ready to lift, At that time I installed truecaller application from then onwards I used to the lift the call by seeing the same shown by truecaller.