411411 /ˌfɔː wʌn ˈwʌn $ ˌfɔːr-/ 
1the telephone number you use in the US and Canada to call directory assistance (=a service which helps you to find someone’s number)2the 411 on something American English information about something: 
the 411 on text messaging
1the telephone number you use in the US and Canada to call directory assistance (=a service which helps you to find someone’s number)2the 411 on something American English information about something: the 411 on text messaging