technology used in mobile phones before 4G or 5G that made it possible to use the internet, watch video, etc. 3G is short for "third generation".

3G came along in 2003 and made it possible to browse web pages, make video calls and download music and video on the move.

They invested heavily in 3G mobile phone networks. 他们投入巨额资金开发3G手机网络。