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&#x27;t have any cryptographical authentication, it&#x27;s trivially easy to spoof a different identity.<p>To have &quot;proper&quot; user authentication, you could just buy blank SIM cards which you can provision with keys and identification as you see fit.<p><a href="http:&#x2F;&#x2F;www.aliexpress.com&#x2F;item&#x2F;SIM-USIM-Card-4G-LTE-Blank-Mini-Nano-micro-SIM-Card-For-Telecommunications-Operator&#x2F;32272750097.html" rel="nofollow">http:&#x2F;&#x2F;www.aliexpress.com&#x2F;item&#x2F;SIM-USIM-Card-4G-LTE-Blank-Mi...</a>