SIM Card Connectors GCT (Global Connector Technology) SIM Card Connectors provide various products for nano (4ff), micro (3ff), and mini (2ff) SIM cards that conform to the GSM11.11 standards. The Subscriber Identity Module (SIM) is a small smart card that is designed to store subscriber's identity, security, authentication, and personal information in a mobile network. The SIM card connectors are fully RoHS and Reach compliant.