短信群发系统是针对于企、事业单位、团体开发的一套短信收发系统，直接用短信群发系统基于GSM/GPRS/CDMA MODEM的短信收发系统的发射器和移动（或联通）公司提供的手机卡短信服务功能，来收、发企业相关信息-Short Message System is targeted at enterprises, institutions, groups developed a set of send and receive text messages, phone card directly usi

CSharp Command Line Program for Send SMS using PDU and AT Commands. It was tested with ZTE and HUAWEI USB GSM Modems. Notice that Modem is Enabled with AT+CFUN 1,0 command when program starts.