Affected devices were manufactured between October 2020 and April 2021. If your iPhone 12 or iPhone 12 Pro doesn’t 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. iPhone 12 mini and iPhone 12 Pro Max models are not part of this program.
You can view the options here to have your iPhone 12 or iPhone 12 Pro serviced. Your iPhone will be examined prior to any service to verify that it is eligible for this program.