To set personalized ringtones for contacts on your phone, follow these steps:

1. Save the audio file you would like to use as a ringtone in the appropriate file on your device.
2. Access contacts list on your device.
3. Select the contact for which you would like to set the ringtone.
4. Tap the Edit icon.
5. Select the panel for ringtone selection.
6. Choose the personalized tone you saved in advance.
7. Save the changes.