problem on at command

[sethuraman]

Hai,
I am work with SIM900 module, and i send AT command with raspberry pi over UART.some commands are working fine but nd then am trying to connect using AT command but the following commands shows the error message
AT+CSTT
AT+CIICR
AT+CIPSTART
AT+TIME




if am send the command AT+CSTT="airtelgprs.com","",""
i get like CME ERROR: 3 Operation not allowed



i am unable browse the internet please help me how to resolve this problem give me the guidance to resolve this problem thanks in advance

 

[sreepss]

Hi
Try to get the return values of the At command by keying
AT+CSTT=?, so it will return the exact syntax

this link may help you

https://www.edaboard.com/threads/261626/