GSM GPRS 4 band module

Model: SIM900.
GSM GPRS 4 band module.
The GPRS module is based on SIMCOM's SIM900 module and is compatible with and its clones. The GPRS shield provides you with a way to communicate using the GSM cell phone network. The shield allows you to obtain SMS, MMS, GPRS and audio via UART by sending AT commands (GSM 7.07, 07.05 and SIMCOM enhanced AT commands). The shield also has the 12 GPIOs, 2 PWMs and an ADC of the SIM900 module (All of them are 2V8 logic) present on board.

Features:
Quad-Band 850/900/1800/1900 MHz: would work on GSM networks in all countries of the world.
GPRS multi-slot class 10/8
Class B GPRS mobile station
GSM phase 2/2+ compliant
Class 4 (2 W @ 850/900 MHz)
Class 1 (1W @ 1800/1900MHz)
Control using AT commands - Standard commands: GSM 07.07 and 07.05 | Improved Commands: SIMCOM AT Commands.
Short Message Service – So you can send small amounts of data over the network (ASCII or plain hexadecimal).
Built-in TCP/UDP stack: Allows you to upload data to a web server.
RTC supported.
Selectable serial port.
Speaker and headphone jacks.
Low power consumption - 1.5mA (sleep mode)
Industrial temperature range: -40°C to +85°C