To ensure your phone uses the Oppo dialer instead of Google’s: ODialer for Android - Download the APK from Uptodown
, which is the safest way to ensure compatibility with Android 13.
If you only want the of Oppo’s dialer, try a third-party dialer with custom themes. For actual calls on Android 13, stick with Google Phone or your stock dialer.
(Optional) You can disable the Google Dialer by long-pressing its icon, selecting , and tapping Disable . Compatibility Note