To turn off two-factor authentication on Apple devices like an iPhone, understand that the two-factor authentication is tied to your Apple ID/Apple Account, not your device.

Two-factor authentication (2FA) provides an effective way to deter people from hijacking an online account. But there's no turning back once it's on.

However, with both two-factor authentication and two-step verification available for Apple ID users, there’s a bit of confusion as to which users should opt for.

To enable two-factor authentication on your Apple ID account, we will have to turn off two-step verification if it is currently enabled. First head to the Apple ID website, and sign in.

Further, multi-factor authentication must already be enabled for the Apple account. To set up this feature, go to Settings and select your name, then choose Sign-In & Security > Two-factor ...