Customer support is a type of service which is made for user satisfaction. Their main objective is to satisfy user Problems and issues. Similarly if you are a genuine Yahoo user and facing difficulty then you want to fix it so visit their official site to get their contact. Call them and test whether it works for 24 hr or not. If you don’t know how to do this then don’t worry we will help you out in seeking the answer of Is Yahoo customer service 24 hours?