LinkSprite ATWIN Quad-band GPRS/GSM Shield for Arduino
This LinkSprite ATWIN Quad-band GPRS/GSM shield has PCB etched antenna, so no need for external antenna.
ATWIN Quad-band GPRS/GSM shield is an ultra compact and high quality wireless module base on infineon UCL2 platform with industy-standard interface.
This is a SMT package with small dimension, low power consumption, quad-band (AT139) and dual-band (AT139D) GSM/GPRS module.
It can provide Voice, SMS and Fax.
for more info see WIKI
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