Unclear Sound When Making or Receiving Calls on OPPO Phone
Have you experienced unclear, echoing, crackling, and static sounds while on a call or when listening to a voicemail on your OPPO phone? This could be related to a signal problem. Try moving around to see if the quality of the call improves. For more troubleshooting steps, read through and follow the steps below.
Note: Check your phone's ColorOS version in [Settings] > [About Phone] / [About Device].
Check your location
When you are located in a no-signal zone, you might hear noises during phone calls. Make sure to use your phone in an area within your operator's network coverage. See OPPO Phone has No Network Coverage or Poor Signal.
Adjust the volume and mode
Adjust the volume with the Volume buttons during phone calls. Make sure that you can see the volume indicator appearing on the screen when you press the volume buttons. You can also switch from receiver to speaker when you are on a call.
Note: If the voice sounds normal when on speaker, check your receiver instead. If you still can't hear clearly, then your phone system or network operator could be the issue.
Check and clean the receiver
The receiver will only work properly if it's not blocked or dirty. Clean the receiver with a clean and soft-bristled brush or cotton bud.
Remove the phone case or screen protector that might block the receiver, then test again.
Check the connected accessories
If your OPPO phone is connected to a headset, make sure it is plugged in firmly. Rotate the headset plug and check if the sound is clear. If a Bluetooth headset is connected, go to [Settings] > [Bluetooth] and reconnect the headset.
Try the headset on other phones and see if it works properly.
Clean the headset plug and remove any obstructions from the headset jack.
Restart the phone and update the software version
Restart your OPPO phone by pressing the Power and Volume Up buttons for 8 to 10 seconds or until you see the OPPO logo, and try to call again. See more in How to Force Restart an OPPO Phone.
Back up the data on your phone, then detect and update the system to the latest software version.
Other issues
If you cannot hear a specific person's voice clearly, it might be their phone's issue.
Consult with your network operator for the network issues.
If the abovementioned steps do not fix your concern, prepare your warranty card and contact your nearest OPPO Customer Service. You can also contact OPPO Support so we can help and assist you further with your concern. Depending on your region, you may check if you need to book an appointment before visiting your local Service Center.
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* Pictures, settings, and paths might differ from those of your phone, but that does not affect the description in this article.