1,8 channel-8 sims gsm gateway 2,IMEI change automatically 3,Call termination 4, ... rotate(8 ports 8 SIM cards) 5,SIP Key features:-GSM 850MHz 900MHz 1800MHz 1900MHz-IMEI auto rotate,auto update IMEI ... call SMS Function(Optional)Overview of AT Commands According to GSM 1,Set FWT to SMS MODE(Connect telephone to ... /GPRS modem 2, Connect date cable to FWT and COM of PC to send SMS 3,Open your SMS software ...