How to get the authentication code of Apple's upgrade authentication identity input?

There are many ways to get the verification code. You can use the verification code displayed on the trusted device to receive short messages or phone calls, or generate the verification code from the trusted device.

Use the verification code displayed on the trusted device.

If the trusted device is iOS 9 or above, the verification code will be automatically displayed on the trusted device. At this point, the trusted device will pop up a small map where the user login ID is located. There is an option to choose whether to allow login. After logging in, you will receive a six-digit verification code. Enter this verification code to complete the login.

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Obtain the verification code from the settings of the trusted device.

If you can't automatically receive the verification code on the trusted device, you can get it by setting, even if the device can't connect to the network. Open Settings->; ICloud ",click your Apple ID, and if there is no network, click" Get Verification Code "; If the device is connected to the internet, click password and account security > get verification code.