Oppo's ColorOS operating system allows us to set our own ringtone for calls and messages in addition to the standard ringtones, and in the case of dual SIM devices, our own ringtone can be set for the SIM card in question.

It doesn't matter in which folder the own ringtone is stored, the function automatically searches the whole memory for supported file formats like MP3.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Tap on  SIM1 Ringtone  /  SIM2 Ringtone
Step 4:  Tap on  Select from files
Step 5:  Choose desired  Ringtone
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Tap on SIM1 Ringtone / SIM2 Ringtone
  4. Tap on Select from files
  5. Choose desired Ringtone

Oppo Instructions
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