How to set up Apple ID dual authentication?

Apple ID double authentication setting method is as follows:

1. First, confirm the system version of the mobile phone, which must be the version above IOS9. You can confirm the current system version of the device in the phone settings-General-About this machine-Version. If the version is lower, please upgrade.

2. Step 2, then turn on the phone setting function.

3. Step 3: Open icoud.

4. Step 4: Click on the account to find the password and security.

5. Step 5: Click to open double authentication according to the page prompts.

6. Step 6: Next, you need to choose the phone number and the authentication method for incoming calls, including SMS and voice calls.

7. In the last step, my mobile phone number will receive the verification code. After entering the verification code, it is opened successfully, and the mobile phone prompts for double authentication. So what? Apple ID dual authentication will be successfully opened.