wasim tariq 
Two-factor authentication is an extra protection measure for your Apple ID that’s designed to make sure that only you can access your account, even if someone else knows your password.
How does it work?
With two-factor authentication, only you can access your account on a trusted device or on the web. When you sign in to a new device for the first time, you’ll need to provide two pieces of information: your password and the six-digit verification code that’s automatically displayed on your trusted devices or sent to your phone number. By entering the code, you verify that you trust the new device. For example, if you have an iPhone and sign in to your account for the first time on a newly purchased Mac, you’ll be prompted to enter your password and the six-digit verification code that’s automatically displayed on your iPhone.
Since your password alone is no longer enough to access your account, two-factor authentication significantly improves the security of your Apple ID, as well as all the personal information you store with Apple.
Once you sign in, you won’t be prompt for a verification code again on that device unless you sign out completely, wipe the device, or need to change your password for security reasons. When you log in to the web, you can designate your browser as a trust browser so that you won’t be prompt for a verification code the next time you log in to that computer.
Trusted devices
A trust device is an iPhone, iPad, or iPod touch with iOS 9 or later, or a Mac with OS X El Capitan or later where you’re already sign in with two-factor authentication. It’s a device that we know is yours and can be use to verify your identity by displaying a verification code from Apple when you sign in on another device or browser. An Apple Watch with watchOS 6 or later can receive verification codes when you sign in with your Apple ID, but it can’t function as a trust password reset device.
Trusted phone numbers
A trusted phone number is a number that can be used to receive verification codes via text message or automated phone call. Must verify at least one trusted phone number to sign up for two-factor authentication.
You should also consider verifying an additional phone number that you can access, such as your home number or that of a close family member or friend. You can fall back on this number if you are temporarily unable to access your main number or your own devices.
Verification codes
A verification code is a temporary code that’s sent to your trusted device or phone number when you sign in to a new device or browser with your Apple ID. You can also get a verification code from the Trusted Device Settings section.
The verification code is different from the device code you enter to unlock your iPhone, iPad, or iPod touch.
Upgrade to two-factor authentication on the web
- Go to appleid.apple.com and sign in with your Apple ID.
- Answer the security questions, then tap Continue.
- You’ll see a message suggesting you update your account security. Tap Continue.
- Click Update account security.
- Enter the phone number you want to use to receive verification codes when you sign in. You can choose whether you want to receive the codes via text message or automated phone call.
- Click Continue.
- Enter the verification code to verify the phone number and activate two-factor authentication.
What to remember when using two-factor authentication
Two-factor authentication greatly improves the security of your Apple ID. Once activated, account login requires both the password and access to trusted devices or phone numbers. To keep your account as secure as possible and to make sure you never lose access, you should follow these simple guidelines:
- Remember your Apple ID password.
- Use one code on all devices.
- Keep trusted phone numbers up to date.
- Keep trusted devices physically protected.
- Manage your account
- You can manage trusted phone numbers, trusted devices, and other account information from your Apple ID account page.
Manage your trusted phone numbers
To use two-factor authentication, you must register at least one trusted phone number where you can receive verification codes. Consider verifying an additional trusted phone number other than your own. If your iPhone is your only trusted device and it’s lost or damaged, you won’t be able to receive the verification codes needed to access your account.
Update your trusted phone number on your Apple ID account page
- Go to appleid.apple.com.
- Sign in with your Apple ID.
- Navigate to the Security section and click Edit.
If you want to add a phone number, click add a trusted phone number and enter it. Choose the option to verify the number with a text message or an automated phone call and click Continue. To remove a trusted phone number, click the x icon next to the phone number you want to remove.
Update trusted phone number using account recovery
- Go to appleid.apple.com.
- Sign in with your Apple ID.
- Select “Didn’t receive a verification code?”, and then choose More options.
- You will be redirected to iforgot.apple.com.
- Complete the request to recover your account. Learn more about account recovery.
