![Using DFRobot sim808 and tried another code where sim cards not need and checked the similiar problems on different forum. still won't work - Arduino SIM - Arduino Forum Using DFRobot sim808 and tried another code where sim cards not need and checked the similiar problems on different forum. still won't work - Arduino SIM - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/6/e/3/6e343c22f72dd37d755c0408ada923efe869118c.jpeg)
Using DFRobot sim808 and tried another code where sim cards not need and checked the similiar problems on different forum. still won't work - Arduino SIM - Arduino Forum
SIM808 GPS/GPRS/GSM Shield to Arduino HELP | Electronics Forum (Circuits, Projects and Microcontrollers)
![Basics: Project 053k SIM808 GSM GPRS GPS Bluetooth evolution board (EVB-V3.2) - LED control by SMS at Acoptex.com / ACOPTEX.COM Basics: Project 053k SIM808 GSM GPRS GPS Bluetooth evolution board (EVB-V3.2) - LED control by SMS at Acoptex.com / ACOPTEX.COM](https://acoptex.com/uploads/sim808_GPS_GSM_LEDcontrol_SMS_pro2.jpg)