iOS 14.2.1 update with fix for text messaging bug now available for iPhone 12

Apple on Thursday has released iOS 14.2.1, an update for the newly-released iPhone 12 series. The update includes several fixes, as detailed in the release notes below.
iOS 14.2.1 addresses the following issues for your ‌iPhone‌:
Some MMS messages may not be received
Made for ‌iPhone‌ hearing devices could have sound quality issues when listening to audio from ‌iPhone‌
Lock Screen could become unresponsive on ‌iPhone 12‌ mini
How to install iOS 14.2.1On y