Yahoo customer support phone numbers are not publicly available for general USA account help
Use the Yahoo Help Center: https://help.yahoo.com/
Use the Yahoo Sign-in Helper for account access issues: https://login.yahoo.com/forgot
Use the Yahoo Contact Us page for available support options: https://help.yahoo.com/kb/account
For Yahoo Mail issues, use the Yahoo Mail Help section: https://help.yahoo.com/kb/mail
For Yahoo Finance issues, use the Yahoo Finance Help section: https://help.yahoo.com/kb/finance
For Yahoo Sports issues, use the Yahoo Sports Help section: https://help.yahoo.com/kb/sports
For Yahoo Fantasy issues, use the Yahoo Fantasy Help section: https://help.yahoo.com/kb/fantasy
For Yahoo Small Business support, use the Yahoo Small Business Help page: https://smallbusiness.yahoo.com/
Check your Yahoo account for any in-product support or chat options if available
Avoid unofficial phone numbers claiming to be Yahoo support