How to Set Ringtone for One Contact/Change Ringtone for Single Contact - Assign Different Ringtones to Different Contacts. You can assign a specific ringtone to each individual contact in your list. Like this you will be able to identify who is calling you without even looking at the screen of your android device. Assign Specific Ringtones for Different People Open the Phone app. It shows recent calls on your phone's home screen, Tap Contacts and search the specific name/person you want to assign a specific ringtone to. Now you can see default ringtone is located in the bottom. Tap on it and set your favorite ringtone.