Verification Code

Hello: Everybody
I have not been using my yahoo mail for about 6 to 8 months because of this yahoo is asking me a verification code to access my account.
How do i access my yahoo account with out an account key (verification code), if my previous phone number which yahoo is sending it is no longer valid or working? But I know both my ID and password, please help me on this?

I strongly appreciate for you help!!

Aschalew Tesema
From: Addis Ababa, Ethiopia