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Topic: Problems with SIM 900 and Arduino UNO; What SIM Card Should I Use? Plz Help! (Read 329 times) previous topic - next topic

ArduinoNoobNeedHelp

I am using an Arduino UNO and a SIMCOM SIM900 GSM/GPRS Shield And my code works.

However when I open the serial monitor I get this message:

Serial Started.
DB:NO RESP
DB:NO RESP
DB:NO RESP
Trying to force the baud-rate to 9600

1200
2400
4800
9600
19200
38400
57600
115200
ERROR: SIM900 doesn't answer. Check power and serial pins in GSM.cpp

status=IDLE

Could it maybe be the SIM Card I am using? I am using a TMOBILE SIM Card. ANd when I put it in the holder, I get a blink every second from the NetLight meaning its not connected. What sim card should I be using. I live in the USA

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