![Amazon.com: OSTENT GSM/GPRS Dual-Band 900/1800MHz 2G Modem with Siemens MC52I Module USB Port Interface at Commands Bulk SMS MMS TCP/IP : Electronics Amazon.com: OSTENT GSM/GPRS Dual-Band 900/1800MHz 2G Modem with Siemens MC52I Module USB Port Interface at Commands Bulk SMS MMS TCP/IP : Electronics](https://m.media-amazon.com/images/I/61E8QF6pHBL._AC_UF894,1000_QL80_.jpg)
Amazon.com: OSTENT GSM/GPRS Dual-Band 900/1800MHz 2G Modem with Siemens MC52I Module USB Port Interface at Commands Bulk SMS MMS TCP/IP : Electronics
![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 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](https://m.media-amazon.com/images/I/71un4n5zzvL.jpg)
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
![Factory Modem Sms Wavecom Q2406b, Send/receive Sms Using Usb 16 Port Modem Pool, Bulk Sms Gsm Modem For Kannel - Modems & Gateways - AliExpress Factory Modem Sms Wavecom Q2406b, Send/receive Sms Using Usb 16 Port Modem Pool, Bulk Sms Gsm Modem For Kannel - Modems & Gateways - AliExpress](https://ae01.alicdn.com/kf/HTB1uL.fdStYBeNjSspkq6zU8VXaV/Factory-modem-sms-wavecom-Q2406B-send-receive-sms-using-usb-16-port-modem-pool-bulk-sms.jpg)