GSM/GPRS module is used to establish communication between a computer and a GSM-GPRS system. Global System for Mobile communication (GSM) is an architecture used for mobile communication in most of the countries. Global Packet Radio Service (GPRS) is an extension of GSM that enables higher data transmission rate. GSM/GPRS module consists of a GSM/GPRS modem assembled together with power supply circuit and communication interfaces (like RS-232, USB, etc) for computer.GSM/GPRS MODEM is a class of wireless MODEM devices which requires a SIM (Subscriber Identity Module) card just like mobile phones to activate communication with the network and an IMEI (International Mobile Equipment Identity) number for their identification.