1,16 ports gsm modem 2,Cluster sending SMS 3,High speed sending 4,Saving time and money Overview The GSM Modem is actually a kind of ... MMS,TCP Protocol, remote control$680.38There are USB GSM Modem and RS232 GSM Modem. Kindly inform me which kind interface and module of ... with me or leave me a message.Thanks.Key FeaturesRS232 GSM modem pool Based on Wavecom industrial modules Q2303A/2403A/2406B/ ...