... 900/1800/1900MHz 2.Sim card slot:64/128sim 3.Bulk sms+fwt 4.16/32 port GSM sms gateway ... . 3.It is FWT with modem pool together,bulk voice call plus bulk SMS , two in one machine,built-in usb ... connect with ordinary telephone set, PBX , VOIP Gateway, Billing meter etc.;6) Employ Industrial module M10(850/900/1800/1900Mhz ... 64 sims,32 port128 sim,GSM sms gateway modem pool for Bulk sms and Voip function