Due to the fact that the new iPhones are equipped only with the FaceID function, and Apple doesn't decide to use a fingerprint reader in its flagship smartphones, with the onset of the pandemic unlocking the iPhone has become more difficult. Usually our faces are covered with masks and from the very beginning, unlocking the phone with FaceID was completely impossible while wearing the mask. Apple later added a feature to unlock the phone while wearing an Apple Watch on their wrist, and the latest version of iOS will allow all users to unlock the phone even while wearing the mask, without the need to buy an Apple Watch.

The new version of iOS marked with the number 15.4 is now available for download and the biggest novelty introduced by this update is the aforementioned ability to unlock the phone while wearing the mask. The new update will recognize the user's face by analyzing the area around the eyes. It is worth mentioning, however, that Apple added such a function only to its flagship devices from the iPhone 12 or newer series. The new iOS update, in addition to introducing new emojis, also adds the ability to support a certificate confirming vaccination against COVID-19 in the Wallet application.

source