1,8 ports gsm modem 2,Cluster sending SMS 3,High speed sending 4 ... 900/1800/1900$396 There are USB GSM Modem and RS232 GSM Modem. Kindly inform me which kind interface and module ... of gsm modem. If you have any question, chat with me or ... me a message.Thanks. Key Features RS232/USB GSM modem pool Based on Wavecom industrial modules Q2303A/Q2403A/Q2406B/Q24plusGSM ...