A simple way to personalize your phone is to change your phone’s ringtone. You can pick unique ringtones for the different lines on your phone. 

To select an incoming call ringtone for your phone or a line: 

1. Tap Settings from Home view, and tap Basic > Ring Type
2. When multiple lines are configured on your phone, tap the line you want to apply a new ringtone to. 
3. From the Ring Type screen, tap the ringtone you want. To hear the ringtone before you change it, tap Play. The default ringtone is Low Trill.