... , Quad-band, industrial standard Sim900,SIM900 Simcom wireless module,Simcom modules,modulesGeneral features * Quad-Band 850/ 900/ 1800/ 1900 MHz* GPRS ... 14.4 kbps* USSD* Non transparent mode* PPP-stack Specifications for SMS via GSM/GPRS* Point to point MO and MT ... at July ,2010)* Embedded AT (available at Q3,2010) Specifications for Voice * Tricodec – Half rate (HR) – Full rate (FR) – Enhanced Full ...