OSTENT GSM/GPRS/Edge Quad-Band 850/900/1800/1900MHz 2G Modem with SIMCOM SIM800 Module COM/RS232/Serial Port at Commands Bulk SMS MMS TCP/IP Industrial-grade 2G modem Module: SIMCOM SIM800, Can be used to send SMS and MMS in bulk. This modem is controlled on COM (serial / RS232) port via AT commands. Can be used to send SMS and MMS in bulk. Compatible with: any software supported AT commands, includes SMS Studio, SMS Caster, SMS deliverer.