Hi, I was using the SIM900 shield to send an SMS, everything worked perfect. When I tried it again at 15 minutes it did not work anymore. #include <SoftwareSerial.h> SoftwareSerial SIM900(7, 8); void setup() { SIM900.begin(19200); delay(25000); Serial.begin(19200); Serial.println("Conectad…

SIM900 stopped working

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