TrueCaller which shows you who the caller is if you donīt have the number saved in your phone book. TrueCaller is supported by more than 100 devices and runs in the background and activates on incoming phone calls and text messages (SMS).
This is how TrueCaller works:
1. You receive a phone call from a number that is not saved in your phone book
2. TrueCaller searches for the number in our databases
3. If TrueCaller finds the number it will be displayed on your screen. If number is not found you will be prompted, "No matches found..."
4. When phone call has ended TrueCaller will ask you if you want to save the caller to your phone book (if the caller is found)