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SOLUTION: Apple iPhone 8 - Voice Call Quality Change After Updating to iOS 12.1.1 or Above
If changes or degradation in voice call quality after updating to iOS 12.1.1, you may need to change a Cellular Setting. This change will only need to be made if the following conditions are met:
Have updated iPhone to software version 12.1.1 or above
o Confirm under Settings > General > About > Version
Has or had Wi-Fi Calling enabled
o Confirm under Settings > Cellular > Wi-Fi Calling – If the user has it turned off, but has enabled the service previously, then flipping the toggle back on will display an “Enable Wi-Fi Calling? > Enable” pop-up with no further actions required.
Enable LTE menu is set to Voice & Data
o Confirm under Settings > Cellular > Cellular Data Options > Enable LTE > Voice & Data
If you do not meet any of these conditions, continue with normal troubleshooting.
If you experience changes or degradation in voice call quality after updating to iOS 12.1.1 and its confirmed that you previously enabled/used Wi-Fi Calling, then go through the following setting change:
Settings > Cellular > Cellular Data Options > Enable LTE > Change to Data Only