Unlike the iOS 14.2 update, which came with updates to iPadOS, watchOS, tvOS, and more, Apple released the update to iOS 14.2.1 only. It is available for the iPhone 12, iPhone 12 mini, iPhone 12 Pro and iPhone 12 Pro Max. To find the update, go to Settings > General > Software update. It exterminates a bug that prevented the reception of certain MMS messages, fixes sound quality problems on some Made for iPhone (MFi) hearing aids when listening to audio on the iPhone, and kills another bug, the one found on the iPhone 12 mini, causes the lock screen to become unresponsive.
Update to iOS 14.2 Added Shazam Music Discovery App to Control Center