The SIM800C from SIMCom is a Quad-band GSM/GPRS Module that operates in the 850/900/1800/1900 MHz bands for voice, SMS, and data information. It delivers a data rate of 85.6 kbps and supports CS 1, 2, 3, and 4 coding schemes. This module also supports point-to-point MO & MT, SMS cell broadcast, and text & PDU modes for SMS. It requires a DC supply from 3.4 to 4.4 V and can be controlled via USB, GPIO, and analog audio interfaces. This module is available in a compact package that measures 17.6 x 15.7 x 2.3 mm and has GSM & Bluetooth antenna pads.