... and Band: GSM850/900/1800/1900MHz 3G modem. Designed with industrial grade, supports SMS, CSD, RS232, AT Commands, with the function of ... sending SMS, alarm system, data transmission, etc .Detailed information A. Wireless Specification1. UMTS/WCDMA/HSDPA/HSUPA 850/900/1900/2100MHz2. Quad ... -band EGSM 850/900/1800/1900MHz3. GPRS/EDGE CLASS 124. HSUPA: 5.76Mbps(UL) / HSDPA: 7. ...