If you have a 2G device, you’ll only ever notice one of these symbols: 2G, Edge, E or GPRS in the top right hand corner of your phone’s screen (next to the signal strength bars) when it’s switched on.
2G phones are typically older phones that are basically best for talking and texting only. Also, older models only feature basic text screens – and that means you may not even see a 2G icon on your phone.
If you see any of these icons: 3G, H+, 4G or LTE on your phone’s screen, then it means your phone is compatible with Optus’ newer network technologies. 3G Single Band phones will show “3G” when in Optus’ 3G 2100 MHz coverage areas, but fall back to 2G outside of these coverage areas. The latter coverage areas will be lost once Optus’ 2G mobile network is closed down.