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The is a quad-band GSM/GPRS module from SIMCom that operates on frequencies 850/900/1800/1900 MHz. It is designed for global communication, allowing microcontrollers like Arduino, PIC, and 8051 to send SMS, make voice calls, and connect to the internet via GPRS.
These libraries are not perfect, but they are extremely useful for functional testing of firmware logic. gsm sim900a library for proteus download