... GPRS Module ,instead of SIM300/SIM340E SIM900A1.Dual-Band 900/ 1800 MHz 2.Original new SIMCOM3.Provide SIMCOM whole seriesSIM900ASIMCom presents an ... an industry-standard interface, the SIM900 delivers GSM/GPRS 900/1800 performance for voice, SMS, Data, and Fax in a small ...