The Removable-User Identity Module (R-UIM) is an entity that stores and manages the identity of the subscriber and related subscription data, as well as, personal data. In GSM the R-UIM is referred to as the Subscriber Identity Module (SIM). The R-UIM is an extension of GSM SIM capabilities to enable operation in a TIA/EIA-136 and TIA/EIA-41 environment and may also facilitate roaming between GSM and TIA/EIA-136 networks.