Why does the iPhone have two factor authentication?

Since the advent of iOS, a two-factor authentication function service has been added to the Apple ID, which is different from two-step verification, which is a layer of external security protection for the Apple ID, and Apple's official website explains this function by ensuring that the Apple ID can only be accessed by oneself.

Steps to turn on two-factor authentication:

Open iPhone settings, find the iCloud option and tap enter;

Select your account information;

Under Account Information, select Password & Security;

Click the [Set Two-Factor Authentication] button below;

Click Continue;

The prompt shown in the following figure is because your current Apple ID has also logged in to other non-iOS9 devices, click [Still to open]; If your current Apple ID has not been bound to a credit card, you can simply click [Still Open].

The steps to use Apple iOS two-factor authentication are as follows: 1. Log in to Apple ID and password on a new device or browser, take logging in to iCloud in the iOS system as an example: the system pops up a two-factor authentication dialog box, if the user's Apple ID has been logged in in two or more iOS devices or macOS devices, and the device system version meets the conditions for using two-factor authentication, the other device will receive Apple ID login request and login location (tested in Chinese mainland this location is often displayed abnormally, such as confirming the operation**, it is recommended to directly ignore the login location), click allow after the system will automatically generate a 6-digit verification code; 2. Enter the verification code you just obtained on the new iOS device to complete the two-factor authentication of the Apple ID; 3. If you don't have a trusted device at hand, you can click "Verification code not received" and choose to send the verification code to a trusted mobile phone number, and the system will provide the verification code in the form of SMS or **.

4. If you can't automatically receive the verification code on a trusted device, you can also get it through "Settings", and you can use it on an offline device. a) Go to Settings > iCloud and tap the username of your Apple ID that's signed in. If the current device is in ** state, click "Password & Security" > "Get Verification Code"; b) If your device is offline, tap "Get Verification Code".

Turn off two-factor authentication for your iPhone on your computer.

1. First use a computer to enter the Apple official website (of course, you can also use a mobile phone to enter in computer mode). Click here to enter Apple's official website, and scroll down to see the words "Manage your AppleID".

2. Click the words "Manage your AppleID" to enter the AppleID account login interface. Enter your AppleID account, click on the arrow, and a password prompt box will appear. After entering your password, click on the arrow to log in, and then enter the "Two-Factor Authentication" screen.

3. Open the iPhone phone with AppleID logged in, and see the "AppleID Login Request" pop-up box. If you are logged in by yourself, click "Allow", and if you are not logged in, click "Allow".

6. Find the "" button in the account information interface, and you can see that the "Two-Factor Authentication" is turned on.

7. Click the "" button, and the blue words "Turn off two-factor authentication" will be displayed on the account information interface.

8. Click on the blue "Turn off two-factor authentication" function, and a pop-up box of "Turn off two-factor authentication" will pop up in order to confirm the operation again. And the pop-up box states that after turning off two-factor authentication, the current AppleID account is only protected by password and security questions.

9. Click the "Turn off two-factor authentication" button on the pop-up box to enter the pop-up box for selecting a new security question. Here, re-select Set three safety questions and set the answers. It's important to remember the questions and answers you set, because when you turn off two-factor authentication, you'll need to verify your identity with security questions when you need to access your account and reset your password.

10. After selecting the new question and filling in the new answer, you need to continue to complete the safety information, mainly to set the date of birth and rescue email. When you forget your password and security questions, you can reset it with a verified rescue email.

11. After filling in the date of birth and rescue email, click the "Continue" button in the pop-up box of "Complete Security Information", and wait for a while to complete the two-factor authentication function.