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OKY3258-1 is a mini quad-band GSM/GPRS module for industrial applications made by OKYSTAR. It supports quad-band GSM/GPRS 850/900/1800/1900 MHz frequency bands and is able to send/receive SMS, making calls, and also use internet connection. The module also has an integrated TCP/IP stack, supports GPS and many more features. It is easily integrated with any design due to its small size and serial port interface. The module is widely used in applications such as security systems, telemetry, remote control, POS terminals, etc.