An LTE network extension (LNE) system includes an LTE access gateway (LAG) and a provisioned database. A plurality of LTE access radios in the LNE system broadcast the same shared PLMN ID (sPLMN ID). The sPLMN ID corresponds to a plurality of service provider core networks, each with a different PLMN. The provisioned database includes information identifying which networks are allowed to use the LNE system and includes service provider network address information. An LTE access radio, transmitting the sPLMN ID detects an attach request from a UE, and forwards the attach request to the LAG, which decides if access is to be allowed, based on a service provider home network PLMN included in an IMSI in the attach request and information in the provisioned database. If access is allowed, the LAG serves as a proxy between the LTE access radio and the UE's service provider home network.