AT+CSQ? returns error
I need help, i am working with Arduino UNO and a GPRS shield, which is powered with an adapter that outputs 12v 500mA. The sim card is placed properly, i checked this with the AT+CPIN? command, but when i try to check the signal level with AT+CSQ?, it just return error. Please can someone help me.
Solution
AT+CSQ? isn't a valid command, however AT+CSQ is - remove the ?.
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