The ringtone on the OnePlus smartphone can be changed at any time.
Pre-installed tones are available for this purpose, which can be set individually for each SIM card if the device is used with two SIM cards (Dual SIM).

To set an individual ringtone for each SIM card, we simply enable the option Setringtonefor each SIM card and select the appropriate SIM.
If the device is used with only one SIM card, this feature will remain hidden.

Note: In addition to the pre-installed ringtones, we also have the option of using a custom ringtone, such as an mp3 file.
For this purpose, all you need to do is save or copy a corresponding file to the internal memory of the device.

Android 10 | OxygenOS 10.0
Change ringtone -  Open the  Settings
Change ringtone -  Tap on  Sounds & vibration
Change ringtone -  Tap on  Phone ringtone and vibration
Change ringtone -  Enable or disable  Set ringtone for each SIM card   (Dual SIM)
Change ringtone -  Choose  SIM card 1 / 2
Change ringtone -  Choose a  ringtone
  1. Open the Settings
  2. Tap on Sounds & vibration
  3. Tap on Phone ringtone and vibration
  4. Enable or disable Set ringtone for each SIM card (Dual SIM)
  5. Choose SIM card 1 / 2
  6. Choose a ringtone

OnePlus Instructions
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