NB-IoT (Narrowband IoT) is a communications technology designed for low power, low data devices to connect to the internet via the same carriers that connect your mobile phone.
The coverage for NB-IoT is approx 30km more from the tower than the 4G network, so if your mobile phone works on the site, you can assume NB-IoT devices will work. Additionally due to the lower signal frequency, penetration through buildings and cement tanks is better than 4G.
Every Farmo NB-IoT enabled device comes with its NB-IoT sim card included.
NB-IoT is not as cheap as LoraWAN (which doesn't require a sim in every device), but then NB-IoT doesn't require the potential purchase and installation of a LoRaWAN gateway.
Whatever technology you choose, the data your device sends and the data that you receive is the same. It doesn't matter how it gets there, just that it gets there. So choose the one that can do the job at the lowest cost.
Click on the map below for detail on Telstra coverage: