Apple has agreed to fix audio issues in some iPhone 12 and iPhone 12 Pro models manufactured through April 2021 for free.
“Apple has determined that a very small percentage of iPhone 12 and iPhone 12 Pro devices may experience sound issues due to a component that might fail on the receiver module,” an Apple Support document notes. “Affected devices were manufactured between October 2020 and April 2021. If your iPhone 12 or iPhone 12 Pro does not emit sound from the receiver when you make or receive calls, it may be eligible for service. Apple or an Apple Authorized Service Provider will service eligible devices, free of charge.”
The free servicing program does not include iPhone 12 mini and iPhone 12 Pro Max models, Apple says, presumably because they do not use the affected components.