Set Up Face ID With a Mask on iOS 15

With the release of iOS 15.4, Apple introduced the ability to unlock an iPhone while wearing a face covering, altering the standard biometric enrollment workflow. This article details the specific changes made to the setup sequence for configuring Face ID with a mask, covering the new initialization prompts, the updated scanning process, and the dedicated requirements for eyeglasses.

Initial Welcome and Opt-In Prompt

Upon updating to iOS 15.4 or later on supported devices (iPhone 12 and newer), users were greeted by a full-screen splash prompt during the initial boot sequence. Unlike previous iterations that only offered standard setup, this screen required an explicit choice between two options: "Use Face ID with a Mask" or "Don't Use Face ID with a Mask." The feature could also be enabled later through Settings > Face ID & Passcode.

Unmasked Registration Requirement

Despite the feature being designed for use with masks, the setup sequence explicitly instructs users to keep their face completely uncovered during configuration. The TrueDepth camera system does not learn what a user looks like under a mask; instead, the setup sequence focuses on analyzing and storing the unique biological features around the eyes and upper face (the periocular region).

Two-Step Facial Scan

If a user selects the mask option, the setup sequence requires a fresh scan, even if regular Face ID was already active on the device:

  1. Primary Scan: The device guides the user to rotate their head in a circle to complete a standard full-face capture.
  2. Periocular Scan: The sequence automatically initiates a secondary, higher-precision scan targeting the eye contours and facial structure visible above a typical mask line.

"Add Glasses" Calibration Step

Because recognizing users by the eye area makes eyewear a significant variable, Apple added an "Add Glasses" step directly into the setup sequence:

  • If a user regularly wears eyeglasses, the sequence prompts for an additional scan while wearing them.
  • Users who own multiple pairs of glasses can repeat this step for each pair to ensure consistent recognition.
  • The setup sequence explicitly notes that sunglasses are not supported when using Face ID with a mask, as dark lenses obstruct the periocular details required for authentication.