... 1800/1900MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption. SIM900B ... can fit almost all requirements in your M2M applications. General features * Quad-Band 850/ 900 ... ( available at July ,2010)* MMS (available at July ,2010)* Embedded AT (available at Q3,2010) GSM GPRS Module Sim 900B (Antenna,Sim holder available)