How to access my yahoo mail if the mobile number is out of access?


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I have a yahoo mail account. I know the email-address and also the password. For security reasons yahoo wants me to enter the verification code it sends to my mobile number. Unfortunately I could not access that mobile number again and yahoo does not allow me to sign-in to my email inbox. How could I resolve this issue? Unfortunately in my account only this verification option exists. Thanks for any help.
I also wanted to remove verification options according to this link, but that options only work if I could sign-in in my account first!