GSM/GPRS Module Sim900A

The GPRS Shield provides you a way to
communicate using the GSM cell phone
network. The shield allows you to
achieve SMS, MMS, GPRS and Audio via
UART by sending AT commands (GSM
07.07 ,07.05 and SIMCOM enhanced AT
Commands). The shield also has the 12
GPIOs, 2 PWMs and an ADC of the
SIM900 module. (They are all 2V8 logic)
present onboard. Quad-Band 850 / 900/ 1800 / 1900
MHz – would work on GSM networks in
all countries