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The SIM900 GSM/GPRS shield is compatible with Arduino. It is based on the 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 on GSM networks in all countries. The shield has microphone and headphone jacks for phone calls. Read our guide to SIM900 GSM GPRS Shield with Arduino.