4G4G /ˌfɔː ˈdʒiː $ ˌfɔːr-/ adjective 
4G technology and services provide a very fast connection to the Internet from mobile phones etc. 4G is short for ‘fourth generation’: 
When will they be launching their 4G network?
4G technology and services provide a very fast connection to the Internet from mobile phones etc. 4G is short for ‘fourth generation’: When will they be launching their 4G network?