That's easy. A software 'sim card' connecting to a 5g network. 5G has some stuff designed in for IOT, presumably those sims would be locked to only talking to a specific set of servers and the devices only send small relatively infrequent messages and so the manufacturer just buys 'bundle' of messages to support the number of devices they have. In bulk this will just be a few pennies per year per device.
Biting the hand that feeds IT
