SIM800A Quadband GSM/GPRS Module convertible as Shield for Arduino

This module is built with SIMCOM Make SIM800 Quad-band GSM/GPRS engine, works on frequencies 850 MHz, 900 MHz, 1800 MHz and 1900 MHz. It is very compact in size and easy to use as plug in GSM Modem.The baud rate is configurable from 9600-115200 through AT command.Initially Modem is in Auto baud mode.The modem needs only two wires (Tx, Rx) except Power supply to interface with microcontroller/Host. Features: High Quality Product (Not hobby grade). Quad-Band GSM/GPRS 850/ 900/ 1800/ 1900 MHz. 5V interface for direct communication with MCU kit. Configurable baud rate. SMA connector with GSM L Type Antenna. Built in SIM Card holder. Built in Network Status LED. Inbuilt Powerful TCP/IP protocol stack for internet data transfer over GPRS. Input Voltage: 9V-12V DC. Headphone jack for audio out. Li-Po battery 3.7 volt pins for supply. Li-Po battery USB charger (3.7volts). CP2102 port for communication with laptop. Figure in the listing shows the pinout of GSM sim800 for testing follow the given steps: 12v supply is given to the DC jack. Inset the simcard. Then push switch to ON. Then power LED is ON , as well as buzzer is ON. There is another two LEDs will on , One is for network selection(Yellow) and Another for range selection(Green) range LED blinks fast that means range is selected. Make connection with PC through TTL . Open hyperterminal and check through commands. When make a call for that no , buzzer is getting ON.