Don’t play with matches, and don’t use Yahoo! to call 911. You can't dial 911 and other emergency service numbers through the Yahoo! Voice services ( Yahoo! Phone Out and Yahoo! Phone In) or Yahoo! Messenger. You should use traditional landline or mobile telephones to dial 911 and other emergency service numbers. Please inform others who are using your Yahoo! Voice services and Yahoo! Messenger that they must dial 911 and other emergency service numbers using traditional landline or mobile telephones.