Go to Settings > Password & Security and tap Turn on Two-Factor Authentication > Continue.
Add a trusted device: Password & Security > Trusted Phone Numbers > Edit > Add a Trusted Phone Number.
Remove a trusted device. Tap Trusted Phone Numbers > Edit andtap Delete next to the number to remove.
This article explains how to secure your iPhone with two-factor authentication (2FA), making it harder for hackers to break into your iPhone and access your data. Instructions cover iOS 13 and later.
How to Set up Two-Factor Authentication on iPhone
Turning on two-factor authentication on the iPhone will secure both your Apple ID and the features of your iPhone that use your Apple ID. Here's how to set it up:
Launch Settings and tap your name at the top of the screen.
Tap Password & Security.
Tap Turn on Two-Factor Authentication > Continue. You may be prompted to answer Apple ID security questions.
As part of the setup process, you'll receive a verification code by text message or phone call. Enter a phone number to receive the code.
Choose to get the code by Text Message or Phone Call and tap Next.
Enter the code. Two-factor authentication is now turned on for your Apple ID and iPhone.
Your Apple ID isn't the only account you can secure using two-factor authentication. Use the feature to enhance the security of many accounts, including Facebook, Gmail, Fortnite, and Yahoo Mail.
As an additional security layer, you can opt to use two-factor authentication to sign into your Apple ID only on trusted devices. This means that even if a hacker gets your Apple ID username and password and the one-time-use code, they'd also need physical access to one of your devices to get into your account. Pretty secure!
To add a trusted device to your account, follow these steps:
Go to your iPhone's Settings app and tap your name > Password & Security.
Under Trusted Phone Numbers, tap Edit.
Tap Add a Trusted Phone Number.
Enter your iPhone passcode.
Enter the trusted device's phone number and select whether you want to verify via text or phone call. Tap Send.
Enter the verification code sent to the trusted device. The device will be added to your Trusted Devices list.
If you're getting rid of a device that you trusted in the past, you need to remove it from your list of trusted devices. If you don't, the next owner of the device might be able to access your account. To remove a device from your Trusted Device list:
Go to your iPhone's Settings app and tap your name > Password & Security.
Under Trusted Phone Numbers, tap Edit.
Tap the red minus sign next to the device you want to remove.
Tap Delete to remove the device.
Tap Remove to confirm.
How to Turn off Two-Factor Authentication on iPhone
Interested in turning off 2FA? You can't.
Once you set up two-factor authentication on iPhone (or any other Apple device), you can't turn it off. That may sound strange, but it's actually another security measure. Turning off two-factor authentication would make your devices and your Apple ID less secure and Apple doesn't want to allow that.
What Is Two-Factor Authentication, and Why Should You Use It?
Two-factor authentication (2FA) is a security system that requires that you have two pieces of information to access an account. The first piece of information, or factor, is a username and password combination. The second factor is usually a randomly generated numerical code.
That's how Apple's 2FA system works. It uses your Apple ID username and password as the first factor and then randomly generates a code when you try to sign into your account. Because each code can only be used once, the system is harder to break. Two-factor authentication is built into the iOS, macOS, iPadOS, tvOS, and Apple websites.
If you're already using two-factor authentication with your Apple ID, you can't turn it off. If you updated to two-factor authentication inadvertently, you can turn it off within two weeks of enrolment. If you do, your account is less secure and you can't use features that require a higher level of security.
Use the built-in authenticator for two-factor authentication: For websites and apps that offer two-factor authentication, fill in automatically generated verification codes without relying on SMS messages or additional apps.
How can I locate my device with Find My iPhone? You can do it by going to iCloud.com and logging into your account. You can also do it from any of your other apple devices using that same Apple ID. Note: if you have two-factor authentication enabled you will need authenticate if doing it online.
This commonly happens due to time sync issues. 2FA systems use global universal time (UTC). Your user device executes a time service to stay in sync with UTC.
With two-factor authentication, you'll need a verification code to sign in with your Apple ID on a new device or browser. Whenever you sign in with your Apple ID on a new device or browser, you'll confirm your identity with your password plus a six-digit verification code.
If Microsoft Authenticator isn't working, make sure notifications are on, your connection is stable, and the app has access to your location. If Authenticator stopped working when you switched to a new phone, you'll need to restore from a backup.
Two-factor authentication is an extra layer of security for your Apple ID designed to ensure that you're the only one who can access your account—even if someone knows your password.
There are a few ways you can get a verification code. You can use the code displayed on your trusted device, get a text or phone call, or generate a code from your trusted device.
Go to Settings > [your name] > Sign-In & Security, then tap Two-Factor Authentication. Tap Edit (above the list of trusted phone numbers), then enter your device passcode when prompted. Do one of the following: Add a number: Tap Add a Trusted Phone Number, then enter the phone number.
On your iPhone go to Settings > [your name] > Sign-In & Security. Tap Turn On Two-Factor Authentication, then tap Continue. Enter a trusted phone number (the number you'll use to receive verification codes), then tap Next. A verification code is sent to your trusted phone number.
Your account is more secure when you need a password and a verification code to sign in. If you remove this extra layer of security, you will only be asked for a password when you sign in. It might be easier for someone to break into your account.
Select Didn't Get a Code? on the sign in screen.Choose to have the code sent to your trusted phone number. You'll get a text message or phone call from Apple with your verification code. This text message might include an additional domain validation line.
To resend the verification email, sign in to your Apple ID account page.Click Resend next to the email address that you want to verify, and we'll send an email to that address.
2-step verification adds an extra layer of security to your Google Account. In addition to your username and password, you'll enter a code that Google will send you via text or voice message upon signing in.
What if I lose access to my trusted devices and trusted phone number? You can request account recovery to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity.
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