After a few months of plugging the network and selling phones capable of the service, Optus has finally switched on its 2300MHz 4G network. That makes it the nation's first multi-band 4G carrier.
The dual-band network, which Optus is annoyingly calling "4G Plus", is now live in Melbourne, Sydney, Brisbane and Adelaide.
The play to launch multi-band 4G isn't aimed at boosting speeds (although that might be an ancillary effect of the launch), primarily it's designed for a more consistent and less congested 4G experience for customers.
By having both an FD-LTE/1800MHz network and a TD-LTE/2300MHz network, Optus can ensure that customers are moved around the network efficiently, ensuring a better service experience for everyone.
Right now the only phones in market that support dual-band 4G are the Samsung Galaxy S4 Mini and the updated Samsung Galaxy S4. Samsung's Galaxy Note III is coming to market with dual-band support, as is the LG G2 and the new Apple iPhone 5c and Apple iPhone 5s.
1800MHz? 2100MHz? 700MHz? What frequencies are Australian 4G networks on right now, and what does the future hold? Here's what you need to know.