Description of SIM900 GSM GPRS Shield Features Here’s some of the most important features of the shield: Compatible with Arduino and clones Based on SIM900 module from SIMCOM Allows you to send SMS, MMS, GPRS and Audio via UART using AT commands. It has 12 GPIOs, 2 PWMs and buit-in ADC of the SIM900 module Quad Band: 850; 900; 1800 and 1900 MHZ, so it should work in all countries with GSM (2G) networks Control via AT commands Supports RTC (real time clock) – it has a holder for a 3V CR1220 battery at the back Guide to SIM900 GSM GPRS Shield with Arduino.
