Yahoo mail How to change phone number

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Colleen Kartak - Updated by Ambucias on 30/12/16 at 05:42 AM
Hello,
I no longer have my old phone number to use to log into my yahoo account. I have my email address for my email as well as for my Google mail but I no longer have my phone old number..
So how do I log into or change my old phone number to get into my yahoo mail??