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I have used the SoftwareSerial library and Serial interface to communicate between SIM800C and Arduino in serial communication mode.

I gave

AT AT+CSQ AT+CGATT? AT+SAPBR=3,1,"CONTYPE","GPRS"

etc via Serial monitor. When I used it for the first time, these commands worked fine. But I put the sim back to my android phone to find the correct APN for 2G settings. After I found out the APN settings, I put the sim back to SIM800C and tried the above commands.

AT and AT+CSQ return OK. But

AT+CGATT?, AT+SAPBR=3,1,"CONTYPE","GPRS" return ERROR.

Then I try following commands too If someone needs to help me find the answer to this question.

I'm a beginner, so I don't need exactly what these commands mean. So if you need more details to ask me.

My intention is to send data to a website.

 AT+CREG?
+CREG: 0,0
OK
at+cgreg?
+CGREG: 0,0
OK
AT+CGATT?  
ERROR
AT+COPS=?
+COPS: (1,"Hutchison Lanka (Pvt)","Hutch","41308"),(3,"Mobitel","MOBITEL","41301"),(2,"CELLTEL INFINITI","CELLTEL","41303"),(3,"DIALOG","DIALOG","41302"),,(0-4),(0-2)
Gayashan Rathnavibhushana
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1 Answers1

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First, You're not registreted in the network. Second, do CGATT=1 If you get error wait, because attach can take a time. Even up to 13,5min. Read 3GPP docs about registering to the network and about GPRS attach procedure.

tom
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