GATE OPENER SIM Card is a specialized SIM card used in gate access control systems that operate via GSM networks. It enables remote control of gates, doors, or barriers by allowing users to open or close them through a mobile phone call or SMS. Once the SIM card is installed in the GSM gate opener device, users can send commands to the system using a registered phone number. These systems are commonly used for secure and convenient entry at residential, commercial, and industrial properties.