Yahoo: I forgot my password and I changed my phone number.
1. Go here.
2. Select "Password and sign in".
3. Select "Forgot Password".
4. Click on "password helper" or click on the phone to get the Yahoo customer service phone number for your region.
5. You can also click on the envelope to open an e-mail case. Know more
For more information: Yahoo Mail Customer Service Number |Yahoo Customer Service Number