Need to change old cell phone number

My yahoo account is ***@***
I can don't show any mail in my ID because I have no use my old number <removed by moderator> this number's sum has broken down so I will trying use new number edit my account but it not done and I have problems last 2month use my account please help me use my account and Cheng my profile mobile phone number is <removed by moderator> edit them pl help support team