MFA/2FA Integration
Two-factor or multi-factor authentication (2FA or MFA) is when a service uses two or more methods to verify who you are when you sign in. For example, in addition to your password, you may also receive a text message with a code you must provide. iOS already does a great job at delivering 2FA codes from text messages, but it could take this further by also grabbing codes from other apps (including Mail) and even integrating with third-party authentication apps (such as Authy or DUO). 2FA is a great way to help keep user data private and secure, and the easier it is to use, the more likely it is that users will enable it.