Amazon.com: OSTENT GSM Modem Pool with Wavecom Q2303A Module 8 Ports USB Interface Emulated COM/RS232 at Commands SMS AU Plug Power Adapter : Electronics
Amazon.com: EC Buying SIM800C USB to GSM Module Quad-Band GSM/GPRS Wireless Module Integrated USB to Serial Chip GSM/GPRS 850/900/1800/1900MHz Support 2G/3G/4G Micro SIM Card/Bluetooth/SMS Data Transmission : Electronics
GSM/GPRS & GPS modem with SIM900/SIM908 module - Open Electronics - Open Electronics
How to use a GSM modem to send sms wirelessly
Fast Shipping USB GSM/SMS modem industrial Single Port Modem SMS Device,GSM MODEM bulk SMS