When creating an Apple account, you will have to add a phone number that can be used as a verification method for things like your iPhone and iPad. It will only be used to confirm your identity in case you forget your password or need to change certain security settings for your account.
Apple uses the Trusted Phone Number as a two-factor authentication system. However, if you ever want to change your number, you will have to add the new one to your Apple account.
Alternatively, you may want to take precautions in case you lose your phone. Luckily, you can also add multiple phone numbers to your Apple account.
A Trusted Phone Number is a phone number that Apple directly ties to your identity, in order to act as a two-factor authentication method. You will use it as a key, every time you log into your account from a different computer or mobile device.
When you want to sign in to your account, you will receive a code on the number that you set as trusted. You then have to use that code to confirm your identity. It is a layer of additional security that does not replace your password. To log into your account, you will need both.
You will also need your Trusted Phone Number if you have to reset your password.
The number that you use to create your Apple account and activate the two-factor authentication option will automatically be set as trusted. However, you can replace it or add more numbers to the list, if you have an iPhone or iPad:
Once you receive the verification code on your phone, enter it and the new number will be confirmed.
To remove a number, simply follow the same steps, but instead of adding a trusted number, press the red minus sign to take a number off the list.
If you don’t want to use an iPhone or iPad to change the Trusted Phone Number, you can also do it using your Mac.
The confirmation process for the new number is similar to the one presented above, but there are different steps that you need to follow to get to the required settings screen.
Just like before, you will receive a code through SMS and you will have to enter it on your Mac to confirm that the phone is in your possession. Once you do this, the new Trusted Phone Number will be attached to your account
Keep in mind that you cannot remove all of your Trusted Phone Numbers without turning Two-Factor Authentication off. If you want to remove all phone numbers associated with your account, first turn off this feature.
Although having multiple Trusted Phone Numbers attached to your Apple ID may seem like a security risk, it can prevent you from getting locked out of your account.
Furthermore, if your phone is stolen, you can use the second number to change your password and lock down your device while you track its location.