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hi,
I also had the same problem. Some of the suggestions the i can tell is ,,,,
=> use a capacitor filter (around 1000uF) in the power supply of the gsm modem.
=> avoid AC power lines passing near the controller and GSM modem
=> the distance between the controller and the gsm...
I am using a sim900a gsm module . It is working fine with 2G sim cards. When i insert 2G/3G sim card i get an error AT+CPIN - Error. can anyone help me out with this.
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