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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
![Sim800l Gprs Gsm Module Micro Sim Card Core Board Quad Band Ttl Serial Port For Arduino - Integrated Circuits - AliExpress Sim800l Gprs Gsm Module Micro Sim Card Core Board Quad Band Ttl Serial Port For Arduino - Integrated Circuits - AliExpress](https://ae01.alicdn.com/kf/S5d2073013e3b4b43a39d3a3cd8db7fb27/SIM800L-GPRS-GSM-Module-Micro-SIM-Card-Core-BOard-Quad-Band-TTL-Serial-Port-For-Arduino.jpg_Q90.jpg_.webp)
Sim800l Gprs Gsm Module Micro Sim Card Core Board Quad Band Ttl Serial Port For Arduino - Integrated Circuits - AliExpress
![arduino - SIM800L V2 not responding to AT Commands from Putty over USB-To-TTL PL2303 - Electrical Engineering Stack Exchange arduino - SIM800L V2 not responding to AT Commands from Putty over USB-To-TTL PL2303 - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/g4Pbv.png)