With the Custom Ring feature, you can have up to four different telephone numbers for your single phone line, and each number will make your phone ring differently. This is a very handy feature if you want to know whether an incoming call is for you or for another member of your household…you’ll be able to hear the difference! Or, use Custom Ring if you want to give out different numbers to different groups of people. For example, you can know whether a call is from friends or family. You can add this useful service to your primary phone number any time for a modest monthly charge.