The network could blindly accept any phone, and distinguish by IMEI (phone identification) instead of IMSI (subscriber identification), I think. But as the form

The network could blindly accept any phone, and distinguish by IMEI (phone identification) instead of IMSI (subscriber identification), I think. But as the former doesn't have any cryptographical authentication, it's trivially easy to spoof a different identity. To have "proper" user authentication, you could just buy blank SIM cards which you can provision with keys and identification as you see fit. http://www.aliexpress.com/item/SIM-USIM-Card-4G-LTE-Blank-Mini-Nano-micro-SIM-Card-For-Telecommunications-Operator/32272750097.html http://www.aliexpress.com/item/SIM-USIM-Card-4G-LTE-Blank-Mi...