This post will explore the several facets of SIM card administration in a GSM Gateway setting, offering helpful advice and industry best practices. How SIM cards allow the gateway to connect to the cellular network. Each SIM card provides a unique identifier (IMSI) for network registration. https://medium.com/@gsmgateway972/how-to-manage-sim-cards-in-a-gsm-gateway-9c02ac51c8b4