Do I need to verify my id and password to start Apple's ios9.3.2?

According to the official information provided by Apple, only devices that meet the following conditions can open dual authentication:

-iPhone, iPad or iPod touch with iOS 9.

-Mac with OS X El Capitan and iTunes 12.3.

-Apple Watch with watchOS 2.

-Apple TV with tvOS (4th generation)

-Windows PC with iCloud(Windows version) v.5 and iTunes 12.3.

On the iPhone, you can see the option of setting two-factor authentication through the path of "Settings -I cloud- Password and Security". Next, let's take a look at the specific steps.

1. Click "Set Double Authentication" at the bottom of the "Password and Account Security" interface.

2. Click Continue.

3. The above prompt appears because your current Apple ID has been logged into other devices outside the iOS 9 system. Just click "Still open".

4. If there is no credit card bound to the current Apple ID, just click "Open it anyway".

5. Add your current mobile phone number.

6. Enter the received SMS verification code.

After the above six steps, the double authentication was successfully started, but it should be noted that more numbers must be added to the "trusted phone number". Even if the mobile phone is lost, we can quickly log in to Apple ID to change the password and use the alternate phone number to receive the verification code for operation.