Oppo: Change the Alarm Sound

When an alarm on your Oppo phone always plays the same tone, the reason is usually simple: each alarm carries its own sound setting, separate from your general notification or ringtone volume. Coloros stores this preference inside the alarm entry itself, so changing your phone's default ringtone in the general sound settings has no effect on alarms you already created.

To change it, open Tap on Clock ➔ Choose an Alarm ➔ Tap on Ringtone. From there you can either Tap on Select from files to use a personal audio file, or pick one of the system tones. Confirm your choice with Tap on Back ➔ Tap on Save to apply it to that specific alarm.

This setting only affects the alarm you edited. If you have several alarms, repeat the steps for each one, since Coloros does not apply one sound to all alarms automatically.

If your alarm plays no sound at all instead of the wrong one, check your media or alarm volume slider first, since a muted volume looks identical to a missing ringtone. The smart alarm tone feature, which gradually adjusts volume and sound to your surroundings, only works once it is enabled separately and is not the same as picking a fixed ringtone.