This article helps troubleshoot in-call sound quality on your iPhone SE
These steps help identify and resolve the underlying cause. After completing each step, test to see if the issue is fixed. If not, continue to the next step.
Verify the volume is turned up.
To turn up the volume, first make a call. After the call is answered, press the Volume up key until the preferred volume is reached.
Verify the data profile is up-to-date.
Verify if coverage is available at your current location.
If your iPhone SE has low signal strength, see if your location is within wireless provider coverage. Depending on your service provider, you can access the coverage map via http://www.boostmobile.com/coverage/ or http://www.virginmobileusa.com/check-cell-phone-coverage.
If your iPhone is in a 4G LTE coverage area, make sure 4G LTE is enabled.
Perform a soft reset.
Performing a soft reset will restart your iPhone and close this guide.
Note: To optimize device performance, be sure your iPhone SE is running the most recent device software. Check for software updates.