Amazon.com: Teyleten Robot SIM800C USB GSM GPRS Wireless Module Quad-Band, 850/900/1800/1900MHz, CH340T USB Chip Support 2G 3G 4G SIM Card USB Communication SMS Data Transmission with Antenna (SIM800C is New) : Electronics
Quectel M66 GSM/GPRS module on adaptor board Evaluation Kits Cellular, GSM/ GPRS M2M, Wireless and IoT TOP-electronics USA: Web-shop
A6 GSM GPRS Module IPEX Interface Module Shield DC 5-9V Input for Arduino STM32 51
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