Loss of trust number

Hello Riham, your Apple account is certainly protected by two-factor authentication, which requires entering a verification code to access your Apple account.

On the appleid.com page, Apple does not ask you to enter your phone number; the page displays part of the phone number, and you just need to click on the link "get the code" or "I didn't receive the code."

If the number listed in your Apple account is a mobile phone (perhaps your iPhone), you will receive a text message from Apple with the verification code that you need to enter on the appleid.com page.
If the number is a landline, you will receive a call from Apple's automated voice server, which will provide you with the code.

If you are unable to do this because the trusted number is no longer valid, use this Apple link and explore your options:

https://iforgot.apple.com/password/verify/appleid