I have been using truecaller from past 2 months and this app is wlnderful. U can easly understand whose call came from unknown number. Its functions are very simple they are not that complicated. Its has its own message and calling app. Its userfriendly anybody Can use it u havr to just login into.it. u do not have to do lot of task to use truecaller just install it from playstore and login using facebook or goggle. They have amazing costumer care service if any problem occurs u can easily contact them. It is the best aap I have used it ti now it feel me safe