To set the iPhone 13's ringtone, first go to the Settings menu and click on the \"Sound & Feel\" option.
Then click \"phone Ringtone\
In addition, users can also record and edit their own ringtones in the \"Personalized Ringtones\".
Finally, after selecting the ringtone, go back to the main Settings menu, click on the \"Notifications\" option, open the \"phone\
To set the ringtone for your iPhone 13 case, you can transfer the desired ringtone to your phone via iTunes or iCloud.
Then, select the \"Sound and Touch\" option in your phone's Settings, go to the \"Ringtone and Vibration Mode\" Settings, find the new ringtone you have added and select it. In addition, you can also download and use third-party ringtone Settings apps through the Apple App Store for more customized ringtone Settings.