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In the Log File, I noticed: ‘+CMS ERROR: n’. What does it mean?

This is a network related error code from the GSM device. This error is likely to be related to your operator.

Although most of the error codes (up to 512) are standard, some manufacturers give their own meaning to these error codes. It’s always a good idea to double check with your GSM modem manual.

Here’s an overview of all common GSM error codes with a description.