Apple released iOS 14.2.1 on Thursday and it is only available for iPhone 12 models due to certain customer bugs.
iOS 14.2.1 Release Notes
iOS 14.2.1 solves the following problems for you iPhone:
- Some MMS messages may not be received
- Made for iPhone hearing aids may have sound quality issues when listening to audio from iPhone
- The lock screen may become unresponsive to iPhone 12 mini
As always, you can install the update by visiting Settings> General> Software Update.