Upload not possible at 5 of 10 bought T-Call SIM800C, need replacement urgent, how to detect faulty boards · Issue #165 · Xinyuan-LilyGO/LilyGo-T-Call-SIM800 · GitHub
Oku Electronics - SIM800L Module is a miniature cellular GSM/GPRS breakout board that allows GPRS transmission, sending and receiving messages, and making and receiving calls. This module supports quad-band GSM/GPRS network, which
![sim800l arduino not working | sim800l led blinking | sim800l blinks 3 times || sim800l not connected - YouTube sim800l arduino not working | sim800l led blinking | sim800l blinks 3 times || sim800l not connected - YouTube](https://i.ytimg.com/vi/xdaKyc7m96c/sddefault.jpg)
sim800l arduino not working | sim800l led blinking | sim800l blinks 3 times || sim800l not connected - YouTube
![sim800l arduino not working | sim800l led blinking | sim800l blinks 3 times || sim800l not connected - YouTube sim800l arduino not working | sim800l led blinking | sim800l blinks 3 times || sim800l not connected - YouTube](https://i.ytimg.com/vi/xdaKyc7m96c/maxresdefault.jpg)