The cheapest mobile network ever conceived?

Henceforth, it seems that in one project, Engineers at communications tech biz Quortus have ported their mobile network core to a #RaspberryPi . This means RaspberryPi plugged into a
radio, such as a domestic femtocell (a miniature base station), to create an operational mobile network capable of supporting GSM, 3G and LTE connections.
About Quortus?

Quortus sells the core software to operators looking to create local switching to reduce backhaul.