quoted foreign technology media MacRumors as reporting that the iPhone 12 and iPhone 12 Pro service plans for the "no sound" problem have been extended for one year. The service will be launched in August 2021. The initial coverage is 2 years after the device purchase date. Now Apple will extend this service cycle to 3 years.

Service plan for iPhone 12 and iPhone 12 Pro with "No Sound" issue
Apple has confirmed that a very small number of iPhone 12 and iPhone 12 Pro devices are affected due to a possible malfunction on the earpiece module of the iPhone 12 and iPhone 12 Pro. Sound problems may occur. The affected devices were manufactured between October 2020 and April 2021.
If your iPhone 12 or iPhone 12 Pro has no sound from the earpiece when you make or receive calls, your device may be eligible for service.
Apple or an Apple Authorized Service Provider will service eligible devices at no charge.
iPhone 12 mini and iPhone 12 Pro Max models are not covered by this plan.
Service Process
Select an option below to service your iPhone 12 or iPhone 12 Pro. Before any service is provided, a technician will inspect your iPhone to verify that your device is eligible for this program.
Find an Apple Authorized Service Provider.
Make an appointment to go to a Apple Store retail store.
If you have questions or need further assistance, please contact Apple Support.
Before accepting service, please back up your iPhone to iCloud or computer. Learn more about preparing your iPhone for service.
If your iPhone 12 or iPhone 12 Pro has any damage that would prevent the repair from being completed (such as a cracked screen), you'll need to resolve the issue before repairing it. In some cases, additional repair costs may apply.
Additional information
Apple may limit repair areas to the country or region of original purchase.
This Apple global program does not extend the standard warranty coverage for iPhone 12 or iPhone 12 Pro. Your consumer law rights are not affected by this program.
This program covers affected iPhone 12 or iPhone 12 Pro devices for 3 years from the date of first retail sale of the device.