16 Port,Quad-band,wok over the world,support 64 sim cards ... ,IMEI number is changable,Supoort bulk voice call & bulk SMS, Hotspot Gateway,16 ... :Quad-band GSM/GPRS 850/900/1800/1900Mhzfrequency.16 individual Channels,each channelwith 4 SIM alot,and ... interface in the right side:16 RJ11 interface output:16 RJ11 Interface, connect 16 tel phone:USB interface to connect ...