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If you experience that the sound quality is bad during calls, try these actions one after the other. Verify after trying each action whether the problem was solved before trying the next one.
- Check the network signal strength in the status bar to make sure your device is connected to a network. If the signal is weak or you have no signal, move to an open location that is free from obstructions, or get close to a window.
- Make sure your hand isn’t covering the phone microphone. If your Xperia device uses a cover or a case, remove it to see if the sound quality improves. Check that there is no water or dust blocking the microphone or the area around the microphone.
- Restart the Xperia device.
- Make a call to another phone to confirm that there isn’t a problem with the ear speaker of the phone you were calling when the problem arose. If possible, make a call with a different SIM card, to make sure that your current SIM card isn’t defective or old.
If the above solutions do not work, try the following:
Use the Tests feature in the Support app to run a microphone and ear speaker test.
Use safe mode to see if an app is causing the problem.
Downloaded applications may affect the performance of your device or cause it to behave unpredictably. Use safe mode to check whether a downloaded application is causing the problem. In safe mode, your device only starts with software and applications that were already installed when you purchased your device. If the device performance improves in safe mode, it’s likely that one or more downloaded applications are affecting the device negatively. If the problem is recent and you’re not sure which application is causing the problem, you can start by uninstalling the most recently downloaded application.
To exit safe mode, restart the device.
Update the software on your device.
Perform a factory data reset
When you perform a factory data reset, you erase all personal data stored on the internal storage of your Xperia device. Make sure that you always back up data stored on the internal storage to an SD card or computer before performing a factory data reset.