I have different ring tones assigned for each of my contacts so I know who's calling me. Under each contact there should be something that says set ringtone. You would do it from there. On my phone I go to the contact open it up and in the upper right hand corner there is a star and then three little dots. I touch the dots and it brings up a drop menu and gives me options one of which is set ringtone. I have the Motorola Turbo