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When discussing digital security, the terms "two-step" and "two-factor" are often used interchangeably. But confusingly, Apple offers two slightly different forms of enhanced security, called two-step authentication and two-factor authentication.
Two-factor authentication is a newer and more secure system that includes interactive push notifications on your iOS devices, like the iPhone. Two-factor authentication has become an essential way to keep your data safe. By requiring two ways to prove that your identity - typically, a password and a verification code sent to your phone - it makes it dramatically harder for a hacker to gain access to your personal or financial data.
If you are still using two-step authentication and want to switch to the two-factor alternative, you need to turn off two-step authentication first.Check out the products mentioned in this article:
iPhone XS (From $729 at Apple)
How to turn off two-step authentication on the iPhone
1. In a web browser, sign into your Apple ID page.
2. In the Security section, make sure it says that "Two-Step Verification" is on.

3. Click "Edit."
4. Click "Turn Off Two-Step Verification." Click again to confirm this is what you want to do.

5. You might need to create a security question and verify your date of birth.
Two-step verification is now turned off. If you want to, you can now turn on two-factor authentication in the Settings app of your iPhone (you can find it by tapping your name at the top of Settings, then Password & Security).
But be aware, once two-factor authetication becomes permanent on your iPhone, you can't turn it off.
How to turn off two-factor authentication on an iPhone (within an available two-week window)
As we've indicated, once you turn on two-factor authentication on an iPhone - unlike two-step authentication - it cannot be turned off. Apple has implemented this to enforce enhanced security for the iPhone and iPad.
There's one exception: You have a two-week window, starting from when you initially activate two-factor authentication, in which to turn it back off. After that, it's permanent.
If you are within that two-week window, you can turn it off from your Apple ID page:
1. In a web browser, sign into your Apple ID page.
2. In the Security section, make sure it says that "Two-Factor Verification" is on.3. Click "Edit."
4. Click "Turn Off Two-Factor Verification." Click "Continue" to confirm this is what you want to do.