*Check if the sim card is in good contact: AT+CPIN?
*Turn the radio on (turn off airplane mode): AT+CFUN=1
*Check that the network mode is set to auto-seek: AT+CNMP=2
*Check the signal quality of the current environment: AT+CSQ
*Check if the registration to the network is successful: AT+CGREG?
*Check internet connection: AT+CPSI?
*Check if the APN corresponds to the operator of the SIM card: AT+CGDCONT?
*Check operator access: AT+COPS?
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